B1372

Diagnostic Chart 1:

Diagnostic Chart 2:

Schematic:

CIRCUIT DESCRIPTION,
The body control module (BCM) and the instrument panel cluster (IPC) receive ignition 1 voltage from the ignition switch through the BCM/CLU fuse when the ignition switch is in the ON or CRANK position. When the BCM senses that ignition 1 is open or shorted to ground, DTC B1372 is set.

CONDITIONS FOR RUNNING THE DTC
^ The ignition switch is on.
^ Voltage supplied to the BCM is in the normal operating range (approximately 9-16 volts).

CONDITIONS FOR SETTING THE DTC
The ignition 1 input is not active for 30 seconds.

ACTION TAKEN WHEN DTC SETS
The BCM stores DTC B1372 in memory.

CONDITIONS FOR CLEARING THE DTC
^ DTC B1372 will clear when the code setting condition is no longer present.
^ All BCM history codes will clear after 100 ignition cycles (from OFF to ON) with no current codes active during the 100 ignition cycles.

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
The numbers listed below refer to the numbers on the diagnostic table.
4. This step determines if the ignition 1 input is shorted to ground.
5. This step determines if the BCM is internally shorted.
6. This step determines if the instrument cluster is internally shorted.
7. This step determines if voltage is supplied from the battery to the BCM/CLU fuse.