Restraint System Diagnosis

DTC B1325

CIRCUIT DESCRIPTION
The inflatable restraint sensing and diagnostic module (SDM) monitors the battery positive voltage input from the battery. If the SDM detects this battery positive voltage circuit is above or below the threshold, then DTC B1325 will set.

DTC DESCRIPTOR




This diagnostic procedure supports the following DTC:
DTC B1325 Device Power 1 (low current 1) Circuit

This vehicle has DTCs which include DTC symptoms. For more information on DTC symptoms refer to DTC Symptom Description in Vehicle DTC Information. DTC Symptom Description

CONDITIONS FOR RUNNING THE DTC
The voltage supplied to the SDM is in the range of 9-16 volts.

CONDITIONS FOR SETTING THE DTC

B1325 03
- The SDM detects a system voltage below 9 volts.
- This condition is present at least 10 seconds.

B1325 07
- The SDM detects a system voltage above 16 volts.
- This condition is present at least 10 seconds.

ACTION TAKEN WHEN THE DTC SETS
- The SDM commands the AIR BAG indicator ON via GMLAN serial data.
- The SDM stores DTC to memory.

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.

TEST DESCRIPTION

Steps 1 - 9:

The numbers below refer to the step numbers on the diagnostic table.
4. This checks the voltage from the supply voltage side of the AIR BAG fuse.
6. This test the battery positive voltage circuit for high or low resistance or an open.
7. This test the battery positive voltage circuit for a short to voltage or ground.