Pinpoint Test A: No Power In All Ignition Switch Positions

Steering Column Switches

Pinpoint Tests

Pinpoint Test A: No Power in All Ignition Switch Positions

Refer to Wiring Diagram Set 13, Power Distribution for schematic and connector information. Diagrams By Number

Normal Operation

Battery voltage is provided to Battery Junction Box (BJB) fuse 1 (30A) along circuit 2037 (RD). Fused battery voltage is then provided to the ignition switch from BJB fuse 1 (30A) along circuit 1050 (LG/VT). The ignition switch then provides power to the Central Junction Box (CJB), the Driver Door Module (DDM) and the Lighting Control Module (LCM) through several different circuits depending on the ignition switch state of operation. The ignition switch has 4 possible states of operation:

- OFF - No power on any circuits
- ACC - Power on circuit 296 (WH/VT)
- RUN - Power on circuits:
- 296 (WH/VT)
- 687 (GY/YE)
- 1717 (VT/OG)

- START - Power on circuits:
- 1522 (DG)
- 1717 (VT/OG)

This pinpoint test is intended to diagnose the following:
- Fuse(s)
- Wiring, terminals or connectors
- Ignition switch



PINPOINT TEST A: NO POWER IN ALL IGNITION SWITCH POSITIONS

NOTICE: Use the Flex Probe Kit for all test connections to prevent damage to the wiring terminals. Do not use standard multi-meter probes.

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A1 CHECK THE IGNITION SWITCH FOR VOLTAGE


- Ignition OFF.
- Disconnect: Ignition Switch C250 .
- Measure the voltage between ground and:
- ignition switch C250-8, circuit 1050 (LG/VT), harness side.
- ignition switch C250-9, circuit 1050 (LG/VT), harness side.




- Are the voltages greater than 10 volts?

Yes
INSTALL a new ignition switch. REFER to Ignition Switch Ignition Switch. TEST the system for normal operation.

No
GO to A2.

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A2 CHECK BJB FUSE 1 (30A) FOR VOLTAGE


- Measure the voltage between BJB fuse 1 (30A), input side and ground.




- Is the voltage greater than 10 volts?

Yes
VERIFY BJB fuse 1 (30A) is OK. If OK, REPAIR circuit 1050 (LG/VT). If not OK, REFER to the Wiring Diagrams to identify the possible causes of the circuit short. TEST the system for normal operation.

No
GO to A3.

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A3 CHECK THE BJB FOR VOLTAGE


- Measure the voltage between BJB C1035 eyelet, circuit 2037 (RD), and ground.




- Is the voltage greater than 10 volts?

Yes
INSTALL a new BJB. TEST the system for normal operation.

No
REPAIR circuit 2037 (RD). TEST the system for normal operation.

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