No Response From OCM (Occupant Classification Module)

NO RESPONSE FROM OCCUPANT CLASSIFICATION MODULE (OCM)












1. TEST FOR INTERMITTENT CONDITION

NOTE: Check for any TSB(s) related to the condition. If a TSB applies, perform the procedure outlined in the TSB before continuing.

NOTE: Check for any active CAN C hardware DTCs, perform DTC before proceeding Testing and Inspection.

1. Turn the ignition on.

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

2. 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. (Z974) GROUND CIRCUIT OPEN





CAUTION: Either the Airbag fuses must be removed or the key must be in the off position BEFORE the OCM harness connectors are either disconnected or connected. Damage to the module can occur if this procedure is not followed.

1. Turn the ignition off.
2. Disconnect the OCM harness connector.
3. Using a 12-volt test light connected to 12-volts, check the (Z974) ground circuit.

Does the test light illuminate brightly for each circuit?

Yes

- Go To 3

No

- Repair the (Z974) ground circuit for an open.
- Perform the BODY VERIFICATION TEST. Body Verification Test

3. (F12) FUSED IGNITION SWITCH OUTPUT (RUN-START) CIRCUIT OPEN OR SHORTED




1. Using a 12-volt test light connected to ground, check the (F12) Fused Ignition Switch Output (Run-Start) circuit.

Does the test light illuminate brightly?

Yes

- Go To 4

No

- Repair the (F12) Fused Ignition Switch Output (Run-Start) circuit for an open or short.
- Perform the BODY VERIFICATION TEST. Body Verification Test

4. (D65) CAN C BUS (+) CIRCUIT OPEN




1. Turn the ignition off.
2. Disconnect the Gateway Module harness connector.
3. Measure the resistance of the (D65) CAN C Bus (+) circuit between the Gateway Module harness connector and the OCM harness connector.

Is the resistance below 5.0 ohms?

Yes

- Go To 5

No

- Repair the (D65) CAN C Bus (+) circuit for an open.
- Perform the BODY VERIFICATION TEST. Body Verification Test

5. (D64) CAN C BUS (-) CIRCUIT OPEN




1. Measure the resistance of the (D64) CAN C Bus (-) circuit between the Gateway Module harness connector and the OCM harness connector.

Is the resistance below 5.0 ohms?

Yes

- Replace and program the Powertrain Control Module.
- Perform the BODY VERIFICATION TEST. Body Verification Test

No

- Repair the (D64) CAN C Bus (-) circuit for an open.
- Perform the BODY VERIFICATION TEST. Body Verification Test