Pinpoint Test B: No Power In ACC

Steering Column Switches

Pinpoint Test B: No Power in ACC

Normal Operation

When in ACC mode, the Body Control Module (BCM) provides ground for the coil (control) side of the run/acc relay located in the BCM (Body Control Module). The run/acc relay is serviced with the BCM (Body Control Module). The BCM (Body Control Module) also provides a ground circuit for the coil side of the accessory delay relay located in the BCM (Body Control Module). The accessory delay relay can be serviced separately from the BCM (Body Control Module).

This pinpoint test is intended to diagnose the following:

- Fuse

- Wiring, terminals or connectors

- Accessory delay relay

- BCM (Body Control Module)

PINPOINT TEST B : NO POWER IN ACC

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

B1 CHECK FOR ACC VOLTAGE AT THE BCM (Body Control Module)

- Disconnect: BCM (Body Control Module) C2280B.

- Ignition In ACC.

- Measure the voltage between BCM (Body Control Module) C2280B-35, circuit CDC33 (VT/GN), harness side and ground.






Is the voltage greater than 10 volts?

Yes
GO to B3.
No
GO to B2.

B2 CHECK THE IGNITION ACC CIRCUIT FOR AN OPEN

- Ignition OFF.

- Disconnect: Ignition Switch C250.

- Measure the resistance between BCM (Body Control Module) C2280B-35, circuit CDC33 (VT/GN), harness side and ignition switch C250-6, circuit CDC33 (VT/GN), harness side.






Is the resistance less than 5 ohms?

Yes
INSTALL a new ignition switch. REFER to Ignition Switch . TEST the system for normal operation.
No
REPAIR circuit CDC33 (VT/GN). TEST the system for normal operation.

B3 CHECK THE ACCESSORY DELAY RELAY

- Ignition OFF.

- Disconnect: Accessory Delay Relay.

- Carry out the appropriate relay component test.


Does the relay pass the test?

Yes
GO to B4.
No
INSTALL a new accessory delay relay. TEST the system for normal operation.

B4 CHECK FOR POWER TO THE ACCESSORY DELAY RELAY

- Measure the voltage between accessory delay relay cavity 3 and ground.






Is the voltage greater than 10 volts?

Yes
GO to B5.
No
GO to B6.

B5 CHECK FOR POWER TO THE RUN/ACC RELAY

- Disconnect: BCM (Body Control Module) Fuse 10 (10A).

- Measure the voltage between BCM (Body Control Module) fuse 10 (10A), input side and ground.






Is the voltage greater than 10 volts?

Yes
GO to B7.
No
GO to B6.

B6 CHECK THE BCM (Body Control Module) BATTERY FEED CIRCUIT FOR AN OPEN

- Disconnect: BCM (Body Control Module) C2280G.

- Measure the voltage between BCM (Body Control Module) C2280G-1, circuit SDC04 (RD or GY), harness side and ground.






Is the voltage greater than 10 volts?

Yes
GO to B7.
No
VERIFY fusible links A and B are OK. If OK, REPAIR circuit SDC04 (RD or GY). If not OK, REFER to the Wiring Diagrams to identify the possible cause of the circuit short [1][2]Diagrams By Number. TEST the system for normal operation.

B7 CHECK FOR CORRECT BCM (Body Control Module) OPERATION

- Disconnect all BCM (Body Control Module) connectors.

- Check the connectors for:
- corrosion

- damaged pins

- pushed-out pins


- Connect all BCM (Body Control Module) connectors and make sure they are seated correctly.

- Connect: BCM (Body Control Module) Fuse 10 (10A) (if previously disconnected).

- Operate the system and verify the concern is still present.

Is the concern still present?

Yes
INSTALL a new BCM (Body Control Module). 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. TEST the system for normal operation.