Normal Operation

Passengers airbag circuit low resistance or short circuit.

Normal Operation

The diagnostic module measures the resistance across pins 2-2 and 2-3 every time the ignition is switched on. The resistance should be 0.9 to 1.1Ω. If the total resistance in the passengers airbag circuit falls below 0.7Ω, fault code 35 will be declared and the airbag lamp will be illuminated.

Note: The nominal resistance of the airbag simulator is 2.5Ω, therefore expect a total circuit resistance reading of 2.4 - 2.6Ω with the simulator fitted.

Caution: The passengers airbag connector contains shorting bars which short circuit pins 1 and 3 of both sides of the connector when disconnected.

DO NOT REMOVE OR DISABLE THE AIRBAG CONNECTOR SHORTING BAR UNDER ANY CIRCUMSTANCES.

The airbag harness shorting bar may be temporarily disabled during the following resistance checks.

Possible Causes

• Poorly mated airbag harness connector. If the connector is poorly mated, the shorting bars may not be fully retracted.
• Faulty shorting bar may short circuit 2-2 and 2-3 together.
• A short across the airbag terminals in the passengers airbag module.

Fault Analysis

1. Disarm the airbag system and check the security of the passengers airbag module connector before disconnecting.
   
   If the connector is secure, complete the disarming procedure, fit the airbag simulators (6.4.21.4). Go to step 2
   
   If the connector is insecure, service as necessary, clear the code 35, rearm the airbags. Check that code 35 does not recur.
2. Disconnect the diagnostic module and remove the plastic wedge from connector 2 (black). Measure the resistance between pins 2-2 and 2-3. The resistance should be 2.4 - 2.6Ω.
   
   If the resistance is 2.4 - 2.6Ω, go to step 4.
   
   If the resistance is below 2.4 - 2.6Ω, go to step 3.
3. Disconnect the airbag simulator at the passengers airbag module and remove the plastic wedge from the harness connector. Measure the resistance between pins 2-2 and 2-3 at the diagnostic module connector.
   
   If the resistance is infinity, the airbag harness is good at this time. Swap the airbag simulators at the drivers and passengers airbag connectors. Repeat the resistance check. If the resistance is less than infinity, there is a fault in the passengers airbag harness connector. Service the connector or replace the harness as necessary. Refit the plastic wedges. Reconnect the diagnostic module. Clear the code 35. Rearm the airbags.
   
   If the resistance is less than infinity, service the bulkhead harness as necessary. Refit the plastic wedges. Reconnect the diagnostic module. Clear the code 35. Rearm the airbags (6.4.21.4).
4. Since the circuit resistance is in specification, the fault must lie in the diagnostic module or in the airbag module.
   
   Substitute a known good diagnostic module. If code 35 recurs with the airbag simulator fitted, there is still a fault in the wiring or the simulator.
   
   If the fault code 35 does not recur, rearm the airbags (6.4.21.4) and retest.
   
   If fault code 35 recurs with the airbag module fitted, the airbag module is faulty. Replace the passengers airbag module (7.8.02.6).