B1380

DTC B1380

DTC DESCRIPTORS

DTC B1380 01
Device Ignition Accessory Circuit Short to Battery

DTC B1380 06
Device Ignition Accessory Circuit Open

DIAGNOSTIC FAULT INFORMATION




Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure. Testing and Inspection

TYPICAL SCAN TOOL DATA

Ignition Accessory/Run - BCM:

Refer to Power Mode Description and Operation for other power mode parameters.

CIRCUIT/SYSTEM DESCRIPTION
As the power mode master (PMM), the body control module (BCM) monitors the ignition inputs off/run/crank voltage, ignition 1 voltage and the accessory voltage signals supplied from the ignition switch. The BCM uses the sequence that the signals appear, their voltage levels, the engine run flag (ERF) status and the remote start status to determine the power mode.

When the vehicle operator places the ignition switch in the ACC or RUN position, the switch supplies B+ to the BCM accessory voltage input terminal.

CONDITIONS FOR RUNNING THE DTC

B1380 01
Ignition switch is in the START position.

B1380 06
Ignition switch is in the RUN position.

CONDITIONS FOR SETTING THE DTC

B1380 01
Accessory voltage circuit is shorted to voltage for more than 2 seconds.

B1380 06
- Accessory voltage circuit is open for more than 2 seconds.
- Ignition 1 voltage, accessory voltage, or off/run/crank voltage circuit shorted to ground.
- Battery positive voltage circuit of the ignition switch open or shorted to ground.

CONDITIONS FOR CLEARING THE DTC
- A current DTC clears when the malfunction is no longer present.
- A history DTC clears when the module ignition cycle counter reaches the reset threshold, without a repeat of the malfunction.

DIAGNOSTIC AIDS
Use the DMM MIN/MAX function to capture/locate intermittent conditions.

A short to ground on any ignition switch output circuit will open the BCM fuse.

If the battery positive voltage circuit of the ignition switch or the BCM fuse is open, the ignition switch will not return to the OFF position.

CIRCUIT/SYSTEM TESTING
1. Ignition OFF.
- If the ignition will not return to the OFF position, disconnect BCM C 1 and proceed to step 5.
2. Verify the scan tool Ignition Accessory Run parameter is Inactive.
- If the parameter is Active, test the accessory voltage circuit for a short to voltage. If the circuit tests normal, test or replace the ignition switch.
3. Ignition ACCY, verify the scan tool Ignition Accessory Run parameter is Active.
- If the parameter is Inactive, test the accessory voltage circuit for an open/high resistance. If the circuit tests normal, proceed to the next step.
4. Ignition OFF, disconnect BCM connector C 1.
5. Ignition RUN, verify that a test lamp illuminates between the accessory voltage circuit and ground.
- If the test lamp does not illuminate, test the off/run/crank voltage, accessory voltage, and ignition 1 voltage circuits of the ignition switch for a short to ground. If the circuits test normal, test the battery positive voltage circuit of the ignition switch for a short to ground or an open/high resistance. If the circuit tests normal, test or replace the ignition switch.
6. If all circuits test normal and the DTC is current, replace the BCM.

REPAIR INSTRUCTIONS
Perform the Diagnostic Repair Verification after completing the repair. Verification Tests

- Control Module References for BCM replacement, setup, and programming
- Ignition Switch Replacement.