Diagnostic Routine P

Diagnostic Routine P

Diagnostic Overview

The Global Positioning System Module (GPSM) Does Not Respond To The Scan Tool

Refer to Wiring Diagram Set 14 for schematic and connector information Electrical Diagrams.

Refer to Wiring Diagram Set 130 for schematic and connector information Electrical Diagrams.

Normal Operation and Fault Conditions

The GPSM (Global Positioning System Module) module communicates with the scan tool through the MS-CAN (Medium Speed Controller Area Network).

Visual Inspection and Diagnostic Pre-checks

Verify BCM (Body Control Module) fuse 29 (20A) is OK.

Pinpoint Test

1. CHECK THE GPSM (Global Positioning System Module) VOLTAGE SUPPLY CIRCUIT FOR AN OPEN

1. Ignition OFF.

2. Disconnect: GPSM (Global Positioning System Module).

3. Ignition ON.

4. Measure:








Is the voltage greater than 11 volts?






2. CHECK THE GPSM (Global Positioning System Module) GROUND CIRCUIT FOR AN OPEN

1. Ignition OFF.

2. Measure:








Is the resistance less than 3 ohms?






3. CHECK THE MS-CAN (Medium Speed Controller Area Network) CIRCUITS BETWEEN THE GPSM (Global Positioning System Module) AND THE DLC (Data Link Connector) FOR AN OPEN

1. Measure:








Are the resistances less than 3 ohms?






4. CHECK FOR CORRECT GPSM (Global Positioning System Module) OPERATION

1. Ignition OFF.

2. Disconnect and inspect the GPSM (Global Positioning System Module) connector.

3. Repair:

- corrosion (replace connector or terminals- clean module pins)
- damaged or bent pins- replace terminals/pins
- pushed-out pins- replace pins as necessary

4. Reconnect the GPSM (Global Positioning System Module) connector. Make sure it seats and latches correctly.

5. Operate the system and verify the concern is still present.

Is the concern still present?