| Table 1: | Device Power Moding |
Circuit Description
Normal vehicle class 2 communication will not commence until the system power mode has been identified. The body control module (BCM) communicates the system power mode to all the modules connected to the class 2 serial data circuit. The BCM monitors the state of the ignition 1 voltage circuit, accessory voltage circuit and the engine run flag (ERF) in order to determine the present system power mode. The ERF is a serial data message from the engine controller.
DTC Descriptors
This diagnostic procedure supports the following DTC:
DTC B1382 Device Ignition 2 (Acc/Run) Circuit Low
Conditions for Running the DTC
The only requirements are voltage and ground.
Conditions for Setting the DTC
The BCM has detected the accessory voltage circuit is open or shorted to ground for greater than one minute when the ignition 1 voltage circuit is high and the engine run flag is true.
Action Taken When the DTC Sets
| • | There is no cluster illumination during bulb check. |
| • | BCM fuse will open with a short to ground present. |
Conditions for Clearing the MIL/DTC
| • | A current DTC clears and the malfunction indicator lamp (MIL) is turned OFF when the fault is no longer present. |
| • | A history DTC clears when the module ignition cycle counter reaches the reset threshold, without a repeat of the fault. |
Diagnostic Aids
Refer to Testing for Intermittent Conditions and Poor Connections .
Key Position | Ignition Accessory/Run | Ignition 1 Run/Crank |
|---|---|---|
RUN | Active | Active |
CRANK | Inactive | Active |
ACCY | Active | Inactive |
OFF | Inactive | Inactive |
Test Description
The numbers below refer to the step numbers on the diagnostic table.
Step | Action | Yes | No |
|---|---|---|---|
Schematic Reference: Power Moding Schematics Connector End View Reference: Master Electrical Component List | |||
1 | Did you perform the Diagnostic System Check - Vehicle? | Go to Step 2 | |
2 |
Does the Ignition 2 Input parameter display High? | Go to Diagnostic Aids | Go to Step 3 |
Does the test lamp illuminate? | Go to Step 4 | Go to Step 5 | |
4 | Inspect for poor connections and terminal tension at the harness connector of the BCM. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs . Did you find and correct the condition? | Go to Step 7 | Go to Step 6 |
5 | Repair the inactive accessory voltage signal circuit for an open, high resistance or a short to ground. Refer to Circuit Testing and Wiring Repairs . Did you complete the repair? | Go to Step 7 | -- |
6 | Replace the BCM. Refer to Control Module References for replacement, setup and programming. Did you complete the replacement? | Go to Step 7 | -- |
7 |
Does the DTC reset? | Go to Step 2 | System OK |
