Diagnostic Instructions
| • | Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure. |
| • | Review Strategy Based Diagnosis for an overview of the diagnostic approach. |
| • | Diagnostic Procedure Instructions provides an overview of each diagnostic category |
DTC Descriptors
DTC B1370 03: MSM Wake Up Circuit Short to GroundDTC B1370 07: MSM Wake Up Circuit Short to Battery
Diagnostic Fault Information
Circuit | Short to Ground | Open/High Resistance | Short to Voltage | Signal Performance |
|---|---|---|---|---|
MSM Wake-Up Signal | B1370 03 | 1 | B1370 07 | -- |
1. Power seats and memory recall functions are inoperative | ||||
Circuit/System Description
Whenever the memory seat module (MSM) is in the sleep mode, the seat interface module (SIM) must apply a voltage signal through the wake-up signal circuit to the MSM before power seat or memory functions are allowed.
Conditions for Running the DTC
The MSM is active.
Conditions for Setting the DTC
BB1370 03
The SIM senses that the MSM wake-up control circuit is shorted to ground.
BB1370 07
The SIM senses that the MSM wake-up control circuit is shorted to B+.
Action Taken When the DTC Sets
Power seats and memory recall functions are disabled.
Conditions for Clearing the DTC
| • | The current DTC clears when the fault is no longer present. |
| • | The history DTC will clear after 50 consecutive fault-free ignition cycles have occurred. |
Reference Information
Schematic Reference
Connector End View Reference
Description and Operation
Memory Seats Description and Operation
Electrical Information Reference
Scan Tool Reference
Control Module References for scan tool information
Circuit/System Testing
- Ignition OFF, disconnect the X3 harness connector at the MSM.
- Ignition ON, test for 8.5 - 10.5 V between the signal circuit terminal 10 and ground.
- If all circuits test normal, replace the MSM.
| ⇒ | If less than the specified range, test the signal circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the SIM. |
| ⇒ | If greater than the specified range, test the signal circuit for a short to voltage. If the circuit tests normal, replace the SIM. |
Repair Instructions
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
Control Module References for SIM and MSM replacement, setup, and programming
