2010 Cadillac CTS Sedan AWD V6-3.6L Page 390
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
