No Response From PSM (Programmable Special Module)

*NO RESPONSE FROM PSM (PROGRAMMABLE SPECIAL MODULE)

For a complete wiring diagram Consult Diagrams/Electrical.





Diagnostic Test

1. TEST FOR INTERMITTENT CONDITION
Turn the ignition on.

NOTE: Ensure the IOD fuse is installed and battery voltage is between 10.0 and 16.0 volts.

With the scan tool, select ECU view.

NOTE: A red X will be next to the module that is not communicating, indicating that the module is not active on the Bus network. A green check indicates that the module is active on the Bus network.

Does the scan tool display a red X next to the module?

Yes

- Go To 2

No

- The no response condition is not present at this time. Using the wiring diagram/schematic as a guide, inspect the wiring for chafed, pierced, pinched, and partially broken wires and the wiring harness connectors for broken, bent, pushed out, and corroded terminals.

2. GROUND CIRCUIT OPEN
Using a 12-volt test light connected to 12-volts, check the ground circuit.
Does the test light illuminate brightly?

Yes

- Go To 3

No

- Repair the ground circuit for an open.
- Perform the BODY VERIFICATION TEST - VER 1.Verification Tests.

3. FUSED B(+) CIRCUIT OPEN OR SHORTED
Turn the ignition on.
Using a 12-volt test light connected to ground, check the Fused B(+) circuit.
Does the test light illuminate brightly?

Yes

- Go To 4

No

- Repair the Fused B(+) circuit for an open or short.
- Perform the BODY VERIFICATION TEST - VER 1.Verification Tests.

4. CAN B BUS CIRCUITS OPEN

NOTE: One open circuit will not cause this condition.

Measure the voltage between the CAN B Bus (-) circuit and ground.
Measure the voltage between the CAN B Bus (+) circuit and ground.
Is there any voltage present on either circuit?

Yes

- Replace the Programmable Special Module.
- Perform the BODY VERIFICATION TEST - VER 1.Verification Tests.

No

- Inspect the connector for damage. Repair the CAN B Bus circuits for an open.
- Perform the BODY VERIFICATION TEST - VER 1.Verification Tests.