Fault Code 33 Passenger Airbag Circuit High Resistance or Open

FAULT CODE 33
Passenger Airbag Circuit High Resistance or Open


Normal Operation
The Air Bag Diagnostic Module (DM) monitors the resistance between pins S and 9. The value of this resistance is normally between 0.9 Ohm and 1.2 Ohm. If the resistance measured exceeds 4 Ohm the MIL Lamp will illuminate and fault code 33 will be present, indicating high resistance or open circuit on the airbag circuit.

Possible Causes
- Faulty passenger-side airbag wiring.
- Open circuit or high resistance in passenger-side airbag.

Fault Diagnosis
1. Circuit-check
- Disarm Airbag/SRS system and disconnect DM.
- Disconnect DM and remove plastic locking wedge from black DM harness connector.
- Measure resistance across harness connections to passenger airbag, wires RP and KR
- Is resistance value greater than 2.2 Ohm?

Yes - Examine harness wiring and connections for open circuit, repair as necessary.
No - Proceed to step 2.

2. Code verification
- Reconnect DM.
- Switch on the ignition and wait 30 seconds.
- Is code 33 still present?

Yes - Renew DM.
No - Proceed to step 3.

3. Code 33-check
- Switch off the ignition.
- Arm the Airbag/SRS system.
- Is code 33 still present?

Yes - Renew passenger-side airbag.
No - Examine harness wiring and connectors for intermittent open circuit.

4. On completion.
Re-arm and verify the Airbag/SRS system.

Electrical Schematic-Passenger-side Airbag Circuit High Resistance Or Open, Fig.1:

1. Instrument Panel Fuse
2. Engine Compartment Fuse
3. Safing Sensor
4. Cable Reel Cassettes
5. Driver-side Airbag
6. Passenger-side Airbag
7. RH Impact Sensor
8. LH Impact Sensor
9. Airbag MIL Lamp
10. Diagnostic Module