B1142
Steering Column Switches
Pinpoint Test E: DTC B1142:29
Normal Operation
When placed in ACC, RUN or START, the ignition switch sends voltage out to the Body Control Module (BCM). Microprocessors in the BCM (Body Control Module) continuously monitor the ignition switch state.
- DTC B1142:29 (Ignition Status 1: Signal Invalid)- sets if the BCM (Body Control Module) does not receive a valid ignition state signal during the BCM (Body Control Module) self-test.
This pinpoint test is intended to diagnose the following:
- Wiring, terminals or connectors
- Ignition switch
- BCM (Body Control Module)
PINPOINT TEST E : DTC B1142:29
E1 CHECK THE IGNITION SWITCH STATE (IGN_SW_STATE) PID
- Ignition ON.
- Enter the following diagnostic mode on the scan tool: BCM (Body Control Module) DataLogger.
- Monitor the IGN_SW_STATE PID while turning the ignition switch through all 4 positions (OFF, ACC, RUN and START).
Does the PID match each ignition switch position?
Yes
GO to E7.
No
GO to E2.
E2 CHECK VEHICLE EQUIPMENT
NOTE: The Circuit Deactivation Ignition Module (CDIM) is not installed on vehicles equipped with a gasoline engine and is optional for vehicles equipped with a diesel engine.
- Verify that the vehicle is equipped with a CDIM (Circuit Deactivation Ignition Module).
Is the vehicle equipped with a CDIM (Circuit Deactivation Ignition Module) ?
Yes
GO to E3.
No
GO to E4.
E3 ISOLATE THE CDIM (Circuit Deactivation Ignition Module)
- Ignition OFF.
- Disconnect: CDIM (Circuit Deactivation Ignition Module) C2500.
- Connect fused jumper wires between CDIM (Circuit Deactivation Ignition Module) C2500-14, circuit CDC62 (WH/VT), harness side and CDIM (Circuit Deactivation Ignition Module) C2500-7, circuit CDC34 (WH/OG) harness side; and between CDIM (Circuit Deactivation Ignition Module) C2500-1, circuit CDC33 (VT/GN), harness side and CDIM (Circuit Deactivation Ignition Module) C2500-8, circuit CDC63 (YE/OG), harness side.
- Monitor the IGN_SW_STATE PID while turning the ignition switch through all 4 positions (OFF, ACC, RUN and START).
Does the PID match each ignition switch position?
Yes
GO to E8.
No
GO to E4.
E4 CHECK THE ACC CIRCUIT FOR AN OPEN OR SHORT TO VOLTAGE
- Ignition In ACC.
- Monitor the IGN_SW_STATE PID with the ignition switch in the ACC position.
Does the PID display "Acc"?
Yes
GO to E5.
No
If the PID displays "Off" or "Unknown", REPAIR circuit CDC33 (VT/GN) for an open. CLEAR the DTCs. REPEAT the self-test. TEST the system for normal operation.
If the PID displays "Run" or "Start", REPAIR circuit CDC34 (WH/OG) for a short to voltage. CLEAR the DTCs. REPEAT the self-test. TEST the system for normal operation.
E5 CHECK THE RUN CIRCUIT FOR AN OPEN OR SHORT TO VOLTAGE
- Ignition ON.
- Monitor the IGN_SW_STATE PID with the ignition switch in the RUN position.
Does the PID display "Run"?
Yes
GO to E6.
No
If the PID displays "Off" or "Unknown", CARRY OUT the ignition switch component test, Component Tests and General Diagnostics for component testing. CLEAR the DTCs. REPEAT the self-test. TEST the system for normal operation.
If the PID displays "Acc" REPAIR circuit CDC34 (WH/OG) for an open. CLEAR the DTCs. REPEAT the self-test. TEST the system for normal operation.
If the PID displays "Start" REPAIR circuit CDC35 (BU/WH) for a short circuit to voltage. CLEAR the DTCs. REPEAT the self-test. TEST the system for normal operation.
E6 CHECK THE START CIRCUIT FOR AN OPEN OR SHORT TO VOLTAGE
- Monitor the IGN_SW_STATE PID with the ignition switch in the START position.
Does the PID display "Start"?
Yes
GO to E7.
No
If the PID displays "Off" or "Unknown", CARRY OUT the ignition switch component test. CLEAR the DTC. REPEAT the self-test. TEST the system for normal operation. Component Tests and General Diagnostics
If the PID displays "Acc" REPAIR circuit CDC34 (WH/OG) for an open. CLEAR the DTC. REPEAT the self-test. TEST the system for normal operation.
If the PID displays "Start" REPAIR circuit CDC35 (BU/WH) for an open. CLEAR the DTC. REPEAT the self-test. TEST the system for normal operation.
E7 CHECK THE BCM (Body Control Module) ELECTRICAL CONNECTORS
- Ignition OFF.
- Disconnect: BCM (Body Control Module) C2280B.
- Disconnect: Ignition Switch C250.
- Check the electrical connectors for:
- corrosion
- damaged pins
- pushed-out pins
- Repair any identified concerns.
- Connect the BCM (Body Control Module) and ignition switch connectors and make sure they are seated correctly.
- Clear the DTCs
- Enter the following diagnostic mode on the scan tool: BCM (Body Control Module) Self-Test.
Is DTC B1142:29 still present?
Yes
INSTALL a new BCM (Body Control Module). TEST the system for normal operation.
No
The customer concern has been corrected. The concern may have been caused by a poor or intermittent connection. TEST the system for normal operation.
E8 CHECK THE CDIM (Circuit Deactivation Ignition Module) GROUND CIRCUIT FOR AN OPEN
- Ignition OFF.
- Measure the resistance between CDIM (Circuit Deactivation Ignition Module) C2500-11, circuit GD184 (BK/GY), harness side and ground.
Is the resistance less than 5 ohms?
Yes
GO to E9.
No
REPAIR circuit GD184 (BK/GY). CLEAR the DTCs. REPEAT the self-test. TEST the system for normal operation.
E9 CHECK THE CDIM (Circuit Deactivation Ignition Module) ELECTRICAL CONNECTOR
- Check the CDIM (Circuit Deactivation Ignition Module) electrical connector for:
- corrosion
- damaged pins
- pushed-out pins
- Repair any identified concerns.
- Connect the CDIM (Circuit Deactivation Ignition Module) connector and make sure it seats correctly.
- Clear the DTCs.
- Enter the following diagnostic mode on the scan tool: CDIM (Circuit Deactivation Ignition Module) Self-Test.
Is DTC B1142:29 still present?
Yes
INSTALL a new CDIM (Circuit Deactivation Ignition Module). REFER to Circuit Deactivation Ignition Module (CDIM) . CLEAR the DTCs and TEST the system for normal operation.
No
The system is operating correctly at this time. The concern may have been caused by a poor or intermittent connection. TEST the system for normal operation.