*NO RESPONSE FROM OCM (OCCUPANT CLASSIFICATION MODULE)

For a complete wiring diagram Refer to Section 8W.

Possible Causes

(Z913) GROUND CIRCUIT OPEN

(A27) FUSED B+ CIRCUIT OPEN OR SHORTED

(D65) CAN C BUS (+) CIRCUIT OPEN

(D64) CAN C BUS (-) CIRCUIT OPEN

OCCUPANT CLASSIFICATION MODULE

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. (Z913) GROUND CIRCUIT OPEN

Disconnect the Occupant Restraint Controller Module harness connectors.
Using a 12-volt test light connected to 12-volts, check the (Z913) ground circuit.

Does the test light illuminate brightly?

Yes

Go To 3

No

Repair the (Z913) ground circuit for an open.
Perform the AIRBAG VERIFICATION TEST - VER 1.

3. (A27) FUSED B+ CIRCUIT OPEN OR SHORTED

Using a 12-volt test light connected to ground, check the (A27) Fused B+ circuit.

Does the test light illuminate brightly?

Yes

Go To 4

No

Repair the (A27) Fused B+ circuit for an open or short.
Perform the AIRBAG VERIFICATION TEST - VER 1.

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

Turn the ignition off.
Disconnect the TIPM C1 harness connector.
Measure the resistance of the (D65) CAN C Bus (+) circuit between the TIPM C1 harness connector and the Occupant Classification Module connector.

Is resistance below 5.0 ohms?

Yes

Go To 5

No

Repair the (D65) CAN C Bus (+) circuit for an open.
Perform the AIRBAG VERIFICATION TEST - VER 1.

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

Measure the resistance of the (D64) CAN C Bus (-) circuit between the TIPM C1 harness connector and the Occupant Classification Module connector.

Is resistance below 5.0 ohms?

Yes

Replace the Occupant Classification Module in accordance with the service information.
Perform the AIRBAG VERIFICATION TEST - VER 1.

Repair the (D64) CAN C Bus (-) circuit for an open.
Perform the AIRBAG VERIFICATION TEST - VER 1.