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2010 Cadillac CTS Sedan AWD V6-3.6L Page 214

moisture sensor control circuit to the outside moisture sensor. When a wipe cycle is needed, the moisture sensor sends a PWM voltage signal

through the moisture sensor signal circuit back to the BCM requesting the wiper operation.

The windshield outside moisture sensor uses the moisture sensor control circuit to command wiper motor wipe cycles and to confirm the moisture

sensor signal circuit is being received. If at anytime communication between the windshield outside moisture sensor and BCM is lost, the BCM will

use the inputs from the windshield wiper/washer switch in the delay positions to operate the wiper motor at continuous variable delay intervals.

Conditions for Running the DTC

Ignition in Run or Accessory positions.

Conditions for Setting the DTC

B370C

An open, short to ground or a short to voltage has been detected on the signal circuit.

B370D

An open, short to ground or a short to voltage has been detected on the control circuit.

Action Taken When the DTC Sets

Moisture sensitive wiper operation is suspended so long as the fault is present. The wipers will still operate normally in all other modes.

Conditions for Clearing the DTC

* A current DTC will clear when the fault is no longer present.

* A history DTC will clear after 40 malfunction-free ignition cycles.

Reference Information

Schematic Reference

Wiper/Washer Schematics (See: Wiper and Washer Systems/Diagrams/Electrical Diagrams)

Connector End View Reference

Component Connector End Views (See: Diagrams/Connector Views)

Description and Operation

Wiper/Washer System Description and Operation (Wiper and Washers) (See: Wiper and Washer Systems/Description and

Operation/Wiper/Washer System Description and Operation (Wiper and Washers))

Electrical Information Reference

* Circuit Testing (See: Testing and Inspection/Component Tests and General Diagnostics/Circuit Testing/Circuit Testing)

* Connector Repairs (See: Testing and Inspection/Component Tests and General Diagnostics/Connector Repairs/Connector Repairs)

* Testing for Intermittent Conditions and Poor Connections (See: Testing and Inspection/Component Tests and General Diagnostics/Circuit

Testing/Testing for Intermittent Conditions and Poor Connections)

* Wiring Repairs (See: Testing and Inspection/Component Tests and General Diagnostics/Wiring Repairs/Wiring Repairs)

Scan Tool Reference

Control Module References (See: Testing and Inspection/Programming and Relearning) for scan tool information

Circuit/System Verification

Ignition ON, wiper switch in the LOW position. The windshield wipers should operate at low speed. If the windshield wipers do not operate, refer

to Windshield Wiper System Malfunction (See: Wiper and Washer Systems/Testing and Inspection/Symptom Related Diagnostic

Procedures/Windshield Wiper System Malfunction).

Circuit/System Testing

1. Ignition OFF, disconnect the harness connector at the windshield outside moisture sensor.

2. Test for less than 5.0 ohms between the ground circuit terminal 3 and ground.

瀚慖f greater than the specified range, test the ground circuit for an open/high resistance.

3. Ignition ON, verify that a test lamp illuminates between ignition voltage circuit terminal 4 and ground.

瀚慖f the test lamp does not illuminate, test the ignition voltage circuit for a short to ground or an open/high resistance.

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Reference Information

Schematic Reference

Engine Controls Schematics (LLT) (See: Diagrams/Electrical Diagrams/Powertrain Management/System Diagram)Engine Controls Schematics

(LF1) (See: Diagrams/Electrical Diagrams/Powertrain Management/System Diagram)

Connector End View Reference

Component Connector End Views (See: Diagrams/Connector Views)

Description and Operation

* Electronic Ignition System Description (See: Powertrain Management/Computers and Control Systems/Description and

Operation/Electronic Ignition System Description)

* Engine Control Module Description (See: Powertrain Management/Computers and Control Systems/Description and Operation/Engine

Control Module Description)

Electrical Information Reference

* Circuit Testing (See: Testing and Inspection/Component Tests and General Diagnostics/Circuit Testing/Circuit Testing)

* Connector Repairs (See: Testing and Inspection/Component Tests and General Diagnostics/Connector Repairs/Connector Repairs)

* Wiring Repairs (See: Testing and Inspection/Component Tests and General Diagnostics/Wiring Repairs/Wiring Repairs)

DTC Type Reference

Powertrain Diagnostic Trouble Code (DTC) Type Definitions (See: Diagnostic Trouble Code Descriptions/Powertrain Diagnostic Trouble Code

(DTC) Type Definitions)

Scan Tool Reference

Engine Control Module Scan Tool Information (V6) (See: Powertrain Management/Computers and Control Systems/Testing and Inspection/Scan

Tool Testing and Procedures)Engine Control Module Scan Tool Information (V8) (See: Powertrain Management/Computers and Control

Systems/Testing and Inspection/Scan Tool Testing and Procedures)Engine Control Module Scan Tool Information (LF1) (See: Powertrain

Management/Computers and Control Systems/Testing and Inspection/Scan Tool Testing and Procedures) for scan tool information

Circuit/System Verification

With the ignition ON, observe the following scan tool parameters for each cylinder:

* Ignition Coil Supply Voltage Bank 1

* Ignition Coil Supply Voltage Bank 2

瀚慐ach parameter should display ON.

Circuit/System Testing

Note: The ignition circuit supplies voltage to other components. Make sure you test all circuits for a short to ground or test all components for

being shorted that share the ignition circuit.

1. Ignition OFF, disconnect the harness connector at the appropriate T8 ignition coil.

2. Ignition ON, verify that a test lamp illuminates between the ignition voltage circuit terminal D and ground of each T8 ignition coil.

瀚慖f the test lamp does not illuminate, test the circuit for a short to ground or an open/high resistance.

瀚慖f the circuit tests normal, with the ignition OFF, disconnect the harness connector at each T8 ignition coil and monitor the fuse while

individually connecting each T8 ignition coil. If the fuse opens, replace the appropriate T8 ignition coil.

3. Ignition OFF, disconnect the K20 ECM harness connector X1.

4. Ignition ON, connect a test lamp between the following ignition voltage circuits and ground:

* X1 67

* X1 62

The test lamp should illuminate on each circuit.

瀚慖f the test lamp does not illuminate, test the ignition circuit for an open/high resistance.

5. If all circuits/connections test normal, replace the K20 ECM.

Repair Instructions

Perform the Diagnostic Repair Verification (See: Verification Tests) after completing the diagnostic procedure.

* T8 Ignition Coil Replacement - Bank 1 (See: Powertrain Management/Ignition System/Ignition Coil/Service and Repair/Ignition Coil

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- Passenger Frontal Deployment Loop Stage 2 Resistance Above Threshold

DTC B0020 0E

- Passenger Frontal Deployment Loop Stage 2 Resistance Below Threshold

DTC B0021 01

- Passenger Side Deployment Loop Short to Battery - Seat Air Bag

DTC B0021 02

- Passenger Side Deployment Loop Short to Ground - Seat Air Bag

DTC B0021 04

- Passenger Side Deployment Loop Open Circuit - Seat Air Bag

DTC B0021 0D

- Passenger Side Deployment Loop Resistance Above Threshold - Seat Air Bag

DTC B0021 0E

- Passenger Side Deployment Loop Resistance Below Threshold - Seat Air Bag

DTC B0022 01

- Passenger Pretensioner Deployment Loop Short to Battery - Retractor

DTC B0022 02

- Passenger Pretensioner Deployment Loop Short to Ground - Retractor

DTC B0022 04

- Passenger Pretensioner Deployment Loop Open Circuit - Retractor

DTC B0022 0D

- Passenger Pretensioner Deployment Loop Resistance Above Threshold - Retractor

DTC B0022 0E

- Passenger Pretensioner Deployment Loop Resistance Below Threshold - Retractor

DTC B0023 01

- Right Roof Rail Deployment Loop Stage 1 Short to Battery

DTC B0023 02

- Right Roof Rail Deployment Loop Stage 1 Short to Ground

DTC B0023 04

- Right Roof Rail Deployment Loop Stage 1 Open Circuit

DTC B0023 0D

- Right Roof Rail Deployment Loop Stage 1 Resistance Above Threshold

DTC B0023 0E

- Right Roof Rail Deployment Loop Stage 1 Resistance Below Threshold

Diagnostic Fault Information

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瀚慖f greater than the specified range, test the ground circuit for an open/high resistance.

3. Connect a test lamp between the control circuit terminal A and the ground circuit terminal B.

4. Ignition ON, turn the stop lamps ON and OFF by applying and releasing the brake pedal. The test lamp should turn ON and OFF when

changing between the selected states.

瀚慖f the test lamp is always ON, test the control circuit for a short to voltage. If the circuit tests normal, replace the BCM.

瀚慖f the test lamp is always OFF, test the control circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace

the BCM.

5. If all circuits test normal, replace the CHMSL.

Repair Instructions

Perform the Diagnostic Repair Verification (See: Verification Tests) after completing the diagnostic procedure.

* High Mount Stop Lamp Replacement (Sedan, V-Series) (See: Lighting and Horns/Center Mounted Brake Lamp/Service and Repair)High

Mount Stop Lamp Replacement (Wagon) (See: Lighting and Horns/Center Mounted Brake Lamp/Service and Repair)

* Control Module References (See: Testing and Inspection/Programming and Relearning) for BCM replacement, setup, and programming

B3920

DTC B3920 or B3921

Diagnostic Instructions

* Perform the Diagnostic System Check - Vehicle (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic System

Check - Vehicle) prior to using this diagnostic procedure.

* Review Strategy Based Diagnosis (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Strategy Based Diagnosis) for an

overview of the diagnostic approach.

* Diagnostic Procedure Instructions (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic Procedure

Instructions) provides an overview of each diagnostic category.

DTC Descriptors

DTC B3920 01

- Group 1 Seat Motors Common Circuit Short to Battery

DTC B3920 02

- Group 1 Seat Motors Common Circuit Short to Ground

DTC B3921 01

- Group 2 Seat Motors Common Circuit Short to Battery

DTC B3921 02

- Group 2 Seat Motors Common Circuit Short to Ground

Diagnostic Fault Information

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3. Test for infinite resistance between the following terminals:

* 30 and 86

* 30 and 87

* 30 and 85

* 85 and 87

瀚慖f less than the specified value, replace the relay.

4. Test for less than 2 ohms between terminals 30 and 87A.

瀚慖f greater than the specified range, replace the relay.

5. Install a 3A fused jumper wire between the relay terminal 85 and 12V. Install a jumper wire between relay terminal 86 and ground. Test for

less than 2 ohms between terminals 30 and 87.

瀚慖f greater than specified range, replace the relay.

Repair Instructions

Perform the Diagnostic Repair Verification (See: Verification Tests) after completing the diagnostic procedure.

* Relay Replacement (Attached to Wire Harness) (See: Power and Ground Distribution/Power Distribution Relay/Service and Repair/Relay

Replacement (Attached to Wire Harness))Relay Replacement (Within an Electrical Center) (See: Power and Ground Distribution/Power

Distribution Relay/Service and Repair/Relay Replacement (Within an Electrical Center))

* Control Module References (See: Testing and Inspection/Programming and Relearning) for BCM replacement, setup, and programming

B3265

DTC B3265

Diagnostic Instructions

* Perform the Diagnostic System Check - Vehicle (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic System

Check - Vehicle) prior to using the diagnostic procedure.

* Review Strategy Based Diagnosis (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Strategy Based Diagnosis) for an

overview of the diagnostic approach.

* Diagnostic Procedure Instructions (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic Procedure

Instructions) provides an overview of each diagnostic category.

DTC Descriptor

DTC B3265 00

- Trunk/Hatch/Liftglass Release Output Circuit

Diagnostic Fault Information

Circuit/System Description

The BCM applies battery positive voltage to the trunk release relay control circuit, which energizes the coil side of the trunk relay. The switch side

of the trunk relay then closes, supplying battery positive voltage through the relay and the latch motor voltage control circuit to the rear

compartment lid latch. The rear compartment lid latch then releases the rear compartment lid so that it may be manually raised to an open position.

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Actions Taken When the DTC Sets

* When DTC B1461 or DTC B1462 sets, the headlamp control module will attempt to return the lamps to a nominal position and disable all

requests to both headlamp actuators.

* The driver information center (DIC) will display AFL Lamps Need Service.

* On vehicles equipped with both AFL and headlamp leveling, the headlamp leveling system will be disabled.

Conditions for Clearing the DTC

* The condition responsible for setting the DTC no longer exists and the ignition is cycled.

* A history DTC will clear once 50 consecutive malfunction-free cycles have occurred.

Diagnostic Aids

Diagnose any faults to the vehicle stability enhancement system (VSES) which contains the steering wheel position sensor before proceeding with

this diagnostic procedure. A fault within the steering wheel position sensor will cause the adaptive forward lighting system to be inoperative.

Reference Information

Schematic Reference

Headlights/Daytime Running Lights (DRL) Schematics (See: Diagrams/Electrical Diagrams/Lighting and Horns/System

Diagram/Headlights/Daytime Running Lights (DRL) Schematics)

Connector End View Reference

Component Connector End Views (See: Diagrams/Connector Views)

Description and Operation

Exterior Lighting Systems Description and Operation (See: Lighting and Horns/Description and Operation/Exterior Lighting Systems Description

and Operation)

Electrical Information Reference

* Circuit Testing (See: Testing and Inspection/Component Tests and General Diagnostics/Circuit Testing/Circuit Testing)

* Connector Repairs (See: Testing and Inspection/Component Tests and General Diagnostics/Connector Repairs/Connector Repairs)

* Testing for Intermittent Conditions and Poor Connections (See: Testing and Inspection/Component Tests and General Diagnostics/Circuit

Testing/Testing for Intermittent Conditions and Poor Connections)

* Wiring Repairs (See: Testing and Inspection/Component Tests and General Diagnostics/Wiring Repairs/Wiring Repairs)

Scan Tool Reference

Control Module References (See: Testing and Inspection/Programming and Relearning) for scan tool information

Circuit/System Verification

Ignition ON, with a scan tool, command the AFL Motor Control left and right while observing both headlamps. The headlamps should turn to the

left and right positions as commanded.

Circuit/System Testing

1. Ignition OFF, disconnect the harness connector at the appropriate headlamp.

2. Remove the AFS 15A fuse.

3. Ignition OFF, scan tool OFF, test for 10 ohm-25k ohm between the control circuit terminals listed below and ground:

* AFL motor control terminal 1

* AFL motor control terminal 2

* AFL motor control terminal 3

* AFL motor control terminal 4

瀚慖f greater than the specified range, test the control circuit for a short to voltage or an open/high resistance. If the circuit tests normal,

replace the headlamp control module.

瀚慖f less than the specified range, test the control circuit for a short to ground. If the circuit tests normal, replace the headlamp control

module.

4. Install the AFS 15A fuse.

5. Ignition ON, scan tool OFF, headlamps ON, verify that a test lamp does not illuminate between the control circuit terminals listed below and

ground:

* AFL motor control terminal 1

* AFL motor control terminal 2

* AFL motor control terminal 3

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Circuit/System Description

The inflatable restraint sensing and diagnostic module (SDM) stores a 4-digit primary key for the inflatable restraint passenger presence system

(PPS). The SDM sends the PPS the primary key. If the PPS determines that it is the wrong primary key, the PPS will set DTC B1001 and send the

SDM a vehicle mismatch message. The SDM then will set DTC B0081 and illuminate the SIR warning indicator. The PPS does not use a secondary

key.

Conditions for Running the DTC

Ignition voltage is between 9-16 volts.

Conditions for Setting the DTC

The 4-digit primary key stored in the SDM does not match the 4-digit key stored in the PPS.

Action Taken When the DTC Sets

* The SDM requests the instrument panel cluster (IPC) to illuminate the AIR BAG indicator.

* The I/P module deployment is disabled.

Conditions for Clearing the DTC

The 4-digit Primary Key in the SDM and in the PPS match.

Diagnostic Aids

This DTC is an indication that the PPS was not set-up correctly, is not the correct part number or that the PPS is defective.

Reference Information

Schematic Reference

SIR Schematics (See: Diagrams/Electrical Diagrams/Air Bag Systems)

Connector End View Reference

Component Connector End Views (See: Diagrams/Connector Views)

Description and Operation

SIR System Description and Operation (See: Restraints and Safety Systems/Air Bag Systems/Description and Operation/SIR System Description

and Operation)

Electrical Information Reference

* Circuit Testing (See: Testing and Inspection/Component Tests and General Diagnostics/Circuit Testing/Circuit Testing)

* Connector Repairs (See: Testing and Inspection/Component Tests and General Diagnostics/Connector Repairs/Connector Repairs)

* Testing for Intermittent Conditions and Poor Connections (See: Testing and Inspection/Component Tests and General Diagnostics/Circuit

Testing/Testing for Intermittent Conditions and Poor Connections)

* Wiring Repairs (See: Testing and Inspection/Component Tests and General Diagnostics/Wiring Repairs/Wiring Repairs)

* SIR/SRS Wiring Repairs (See: Testing and Inspection/Component Tests and General Diagnostics/Wiring Repairs/SIR/SRS Wiring Repairs)

Scan Tool Reference

Control Module References (See: Testing and Inspection/Programming and Relearning) for scan tool information

Circuit/System Verification

Important: When removing connectors inspect for damage or corrosion. Damage or corrosion in the following requires repair or

replacement of the affected.

* PPS

* PPS wiring harness

1. Verify the correct PPS part number has been installed

瀚慖f the wrong PPS part number was installed, replace with the correct PPS.

2. Verify that DTC B1001 is not set as current in the PPS.

瀚慖f DTC is set as current, perform the Setup New PPS procedure. Verify the SDM is sending the correct key. If DTC resets replace the