Pinpoint Test D: No Power in START

Steering Column Switches

Pinpoint Tests

Pinpoint Test D: No Power in START

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

Refer to Wiring Diagram Set 20, Starting System for schematic and connector information. Diagrams By Number

Normal Operation

When the ignition switch is turned to the START position, a voltage signal is sent to the Body Control Module (BCM) and the PCM. The BCM sends out a voltage signal to various modules to indicate a start event and the PCM checks various inputs and bus messages in an effort to start the vehicle.

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

PINPOINT TEST D: NO POWER IN START

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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D1 CHECK THE IGNITION SWITCH

- Ignition OFF.
- Disconnect: Ignition Switch C250.
- Carry out the Ignition Switch Component Test.

- Is the ignition switch OK?

Yes
REINSTALL the ignition switch and CONNECT the ignition switch connector removed during the component test. GO to D2.

No
INSTALL a new ignition switch. REFER to Ignition Switch Ignition Switch. TEST the system for normal operation.

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D2 CHECK THE START CIRCUIT TO THE BCM FOR VOLTAGE

- Ignition OFF.
- Disconnect: BCM C2280B.
- Measure the voltage between BCM C2280B-47, circuit CDC35 (BU/WH), harness side and ground, while holding the key in the START position.




- Is the voltage greater than 10 volts?

Yes
GO to D3.

No
REPAIR circuit CDC35 (BU/WH) for an open. TEST the system for normal operation.

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D3 CHECK THE START CIRCUIT TO THE PCM FOR VOLTAGE

- Ignition OFF.
- Disconnect: PCM C1551B (3.5L), C175B (3.7L) or C1381B (5.0L/6.2L).
- For 3.5L, measure the voltage between PCM C1551B-47, circuit CDC35 (BU/WH), harness side and ground, while holding the key in the START position.




- For 3.7L, 5.0L and 6.2L, measure the voltage between PCM C175B-16 or C1381B-16, circuit CDC35 (BU/WH), harness side and ground, while holding the key in the START position.




- Is the voltage greater than 10 volts?

Yes
REFER to Starting System Testing and Inspection to diagnose the starting system. TEST the system for normal operation.

No
REPAIR circuit CDC35 (BU/WH) for an open. TEST the system for normal operation.

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