Pinpoint Test A : No Power In All Ignition Switch Positions - Conventional Ignition Switch
- A1 CHECK THE IGNITION SWITCH
- Ignition OFF.
- Disconnect: Ignition Switch C250 .
- Carry out the ignition switch component test. REFER to Wiring Diagrams Cell 149 for schematic and connector information.
Is the ignition switch OK?
Yes GO to A2 No INSTALL a new ignition switch.REFER to: Ignition Switch . - A2 CHECK FOR POWER TO THE IGNITION SWITCH
- Measure:
Positive Lead Measurement / Action Negative Lead C250-4 Ground
Is the voltage greater than 11 volts?
Yes GO to A4 No VERIFY BCM fuse 78 (5A) is OK. If OK, GO to A3 If not OK, REFER to the Wiring Diagrams information to identify the possible cause of the circuit short. - Measure:
- A3 CHECK FOR POWER TO BCM (BODY CONTROL MODULE) FUSE 78 (5A)
- Verify BCM fuse 78 (5A) is installed.
Is the voltage greater than 11 volts?
Yes REPAIR the circuit between BJB fuse 4 (50A) and ignition switch C250 . No VERIFY the BJB fuse 4 (50A) is OK. If OK, REPAIR the BCM voltage supply circuit. If not OK, REFER to the Wiring Diagrams information to identify the possible cause of the circuit short. - A4 CHECK FOR CORRECT BCM (BODY CONTROL MODULE) OPERATION
- Disconnect and inspect all BCM connectors.
- Repair:
- corrosion (install new connector or terminals - clean module pins)
- damaged or bent pins - install new terminals/pins
- pushed-out pins - install new pins as necessary
- Reconnect the BCM connectors and all previously disconnected exterior system connectors. Make sure they seat and latch correctly.
- Operate the system and determine if the concern is still present.
Is the concern still present?
Yes CHECK OASIS for any applicable Technical Service Bulletins (TSBs). If a TSB exists for this concern, DISCONTINUE this test and FOLLOW TSB instructions. If no Technical Service Bulletins (TSBs) address this concern, INSTALL a new BCM.REFER to: Body Control Module (BCM) . No The system is operating correctly at this time. The concern may have been caused by module connections. ADDRESS the root cause of any connector or pin issues.