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, verify that when the DIC switches are pressed and released the DIC scan tool parameters toggle between Active and Inactive.
Circuit/System Testing
1. Ignition OFF, disconnect the harness connector at the DIC switch assembly.
2. Ignition OFF, test for less than 1 ohm between the low reference terminal 2 and ground.
锟斤拷 If greater than the specified range, test the low reference circuit for an open/high resistance.
3. Ignition OFF, test for less than 5 ohms between the ground circuit terminal 5 and ground.
锟斤拷 If greater than the specified range, test the ground circuit for an open/high resistance.
4. Ignition ON, verify that all of the scan tool DIC Switch parameters are Inactive.
锟斤拷 If any are not Inactive, test the signal circuit terminal listed below for a short to ground. If the circuit tests normal, replace the IPC.
* DIC Switch Signal Terminal 1
* DIC Select Switch Signal Terminal 3
5. Ignition ON, install a 3A fused jumper wire between the signal circuit terminal 1 and the low reference circuit terminal 2. Verify the scan tool
DIC Switch parameters, except the DIC Fuel Info. parameter, are Active.
锟斤拷 If any are not Active, test the signal circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the IPC.
6. Ignition ON, install a 3A fused jumper wire between the signal circuit terminal 3 and ground. Verify the scan tool DIC Fuel Info. parameter is
Active.
锟斤拷 If not Active, test the signal circuit for a short to voltage or and open/high resistance. If the circuit tests normal, replace the IPC.
7. If all the circuits test normal, test or replace the DIC switch assembly.
Repair Instructions
Perform the Diagnostic Repair Verification (See: Verification Tests) after completing the diagnostic procedure.
* Driver Information Display Switch Replacement (Except Cadillac) (See: Accessories and Optional Equipment/Driver / Vehicle Information
Display Switch/Service and Repair/Driver Information Display Switch Replacement (Except Cadillac))Driver Information Display Switch
Replacement (Cadillac) (See: Accessories and Optional Equipment/Driver / Vehicle Information Display Switch/Service and Repair/Driver
Information Display Switch Replacement (Cadillac))
* Control Module References (See: Testing and Inspection/Programming and Relearning) for the IPC replacement, setup, and programming
B3578
DTC B0158, B0163, B0168, B0173, B0178, B0509, B0514, B3578, or B3583
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 B0158 02
- Outside Air Temperature Sensor Circuit Short to Ground
DTC B0158 05
- Outside Air Temperature Sensor Circuit Short to Battery or Open
