B1374

DTC B1374

CIRCUIT DESCRIPTION
The body control module (BCM) uses the ignition 0, ignition 1, and ignition 3 inputs to determine the power mode of the vehicle. The BCM may store a DTC if it detects an invalid combination of ignition input signals. If the BCM senses that ignition 0 and 3 are active and ignition 1 is inactive while the engine is running, DTC B1374 sets.

DTC DESCRIPTOR
This diagnostic procedure supports the following DTC:
DTC B1374 Device Ignition 1 (ON and START) Circuit Open

CONDITIONS FOR RUNNING THE DTC
The engine has been running for at least 20 seconds.

CONDITIONS FOR SETTING THE DTC
The ignition 1 input is inactive.

ACTION TAKEN WHEN THE DTC SETS
- The SERVICE VEHICLE SOON indicator illuminates.
- The check gages chime sounds.

CONDITIONS FOR CLEARING THE DTC
- A current DTC B1374 will clear when the ignition switch is cycled, and the code setting condition is no longer present.
- A history DTC clears when the ignition cycle counter reaches the reset threshold, without a repeat of the malfunction.

DIAGNOSTIC AIDS
If the DTC is a history DTC, the problem may be intermittent. Perform the tests shown while wiggling the wiring and connectors. This can often cause the malfunction to appear.

TEST DESCRIPTION

Steps 1-12:

The numbers below refer to the step numbers on the diagnostic table.
4. This step determines if the ignition 1 circuit is shorted to ground.
5. This step determines if the BCM is internally shorted.
6. This step determines if voltage is supplied from the battery to the fuse.