Pinpoint Test K: DTC B108A:12
Steering Column Switches
Pinpoint Test K: DTC B108A:12
Refer to Wiring Diagram Set 20, Starting System for schematic and connector information Electrical Diagrams.
Normal Operation
Fused battery voltage is sent to one set of contacts in the start/stop switch from Body Control Module (BCM) fuse 28 (15A). When the switch is pressed, voltage is sent to the Body Control Module (BCM), the Remote Function Actuator (RFA) module and the PCM. The other set of contacts in the start/stop switch connects the BCM (Body Control Module) to ground. When the switch is pressed, the BCM (Body Control Module) detects this ground signal and takes appropriate action.
NOTE: The RFA (Remote Function Actuator) module is only capable of setting DTC B108A:12 as a continuous memory DTC. It is possible for this DTC to be cleared and not return even if the condition that caused it is still present. If DTC B108A:12 is retrieved, carry out this pinpoint test even if the DTC does not return.
- DTC B108A:12 (Start Button: Circuit Short to Battery)- This DTC sets if the RFA (Remote Function Actuator) module detects a short to voltage on the start/stop switch input circuit, or if start/stop switch is stuck in the closed position.
This pinpoint test is intended to diagnose the following:
- Start/stop switch
- Wiring, terminals or connectors
- RFA (Remote Function Actuator) module
- BCM (Body Control Module)
- PCM
PINPOINT TEST K : DTC B108A:12
K1 CHECK THE START/STOP SWITCH 1 (Crk_Fact_B1) PID
- Enter the following diagnostic mode on the scan tool: DataLogger- RFA (Remote Function Actuator) Module.
- Monitor the Crk_Fact_B1 PID while pressing and releasing the start/stop switch:
Does the PID display YES when the start/stop switch is pressed and NO when the start/stop switch is released?
Yes
GO to K5
No
If the Crk_Fact_B1 PID displays YES at all times, GO to K2.
If the Crk_Fact_B1 PID displays NO at all times, GO to Pinpoint Test J Pinpoint Test J: DTCs B108A:01 and B1142:29.
K2 ISOLATE THE PCM
- Disconnect: PCM C175B.
- Monitor the Crk_Fact_B1 PID.
Does the PID change from YES to NO when C175B is disconnected?
Yes
INSTALL a new PCM. CLEAR the DTC. REPEAT the self-test. TEST the system for normal operation.
No
GO to K3.
K3 ISOLATE THE BCM (Body Control Module)
- Disconnect: BCM (Body Control Module) C2280B.
- Monitor the Crk_Fact_B1 PID.
Does the PID change from YES to NO when C2280B is disconnected?
Yes
INSTALL a new BCM (Body Control Module). CLEAR the DTC. REPEAT the self-test. TEST the system for normal operation.
No
GO to K4.
K4 ISOLATE THE START/STOP SWITCH
- Disconnect: Start/Stop Switch C2195.
- Monitor the Crk_Fact_B1 PID.
Does the PID change from YES to NO when C2195 is disconnected?
Yes
INSTALL a new start/stop switch. REFER to Start/Stop Switch . CLEAR the DTC. REPEAT the self-test. TEST the system for normal operation.
No
REPAIR circuit CPK34 (BN/VT). CLEAR the DTC. REPEAT the self-test. TEST the system for normal operation.
K5 CHECK FOR CORRECT RFA (Remote Function Actuator) MODULE OPERATION
- Disconnect: All RFA (Remote Function Actuator) Module Connectors.
- Check the connectors for:
- corrosion
- damaged pins
- pushed-out pins
- Connect: All RFA (Remote Function Actuator) Module Connectors.
- Connect: PCM C175B.
- Connect: BCM (Body Control Module) C2280B.
- Connect: Start/Stop Switch C2195.
- Make sure the connectors are seated correctly, then operate the system and verify the concern is still present.
Is the concern still present?
Yes
INSTALL a new RFA (Remote Function Actuator) module. CONFIGURE the new RFA (Remote Function Actuator) module. REFER to Programmable Module Installation (PMI) in Information Bus Programmable Module Installation (PMI).
CARRY OUT a Passive Anti-Theft System (PATS) Parameter Reset. REFER to Passive Anti-Theft System (PATS) Parameter Reset-Intelligent Access (IA) in Antitheft and Alarm Systems Passive Anti-Theft System (PATS). PROGRAM 2 Intelligent Access (IA) keys. REFER to Key Programming Using Diagnostic Equipment-Intelligent Access (IA) in Antitheft and Alarm Systems Key Programming Using Diagnostic Equipment. REPEAT the self-test. TEST the system for normal operation.
No
The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector. CLEAR the DTC. REPEAT the self-test. TEST the system for normal operation.