B1337

Airbag, Passenger





Fault symptoms
Airbag warning lamp on.

Conditions
The following conditions are applicable to the respective diagnostic trouble codes:

B1337
- The resistance measured by the control module is higher than 3.67 ohms for 10 s.
- The resistance measured by the control module is higher than 225 ohms for 160 ms.
- Fault diagnosis will not be carried out if diagnostic trouble code B2337 or B2338 has been generated.

B1338
- The resistance measured by the control module is lower than 1.34 ohms for 20 s.
- Fault diagnosis will not be carried out if diagnostic trouble code B2337 or B2338 has been generated.

B2337
- The voltage applied to control module pin 2 is lower than 1.5 V for 1.25 s.

B2338
- The voltage applied to control module pin 1 is higher than 3.5 V for 1.25 s.

Action

1. Check on the wiring harness between the control module and the passenger airbag




- Turn the ignition switch to the OFF position.

- Check the wiring's 2-pin connector for an open circuit and/or pin slide-out and rectify it as necessary.




- Connect the reference resistor 86 12 095 to the 2-pin connector.




- Undo the connector: Control Module Airbag: (331)
- Check and if necessary rectify pins 3 and 4 with respect to open circuit(pin slide-out.
- Connect a break-out box (BOB) to the mains.
- Select the trouble code that has been generated

B1337, B1338
- Go to step 2.
B2337, B2338
- Go to step 4.

2. Check on the wiring harness between the control module and the passenger airbag
- Take a resistance reading




- Red feed cable: Control module Airbag: 3
- Black feed cable: Control module Airbag: 4
- The value should be 2 - 4 ohms

Test results OK?

YES
- Change: Airbag, passenger
- Go to step 6.
NO
- Go to step 3.

3. Rectify wiring
- Repair or replace the wiring.
- Go to step 6.

Test results OK?

YES
- The steps taken to rectify the fault were correct.
NO
-

4. Check on the wiring harness between the control module and the passenger airbag
- Take a resistance reading




- Red feed cable: Control module Airbag: 3




- Black test lead: Car battery: B-.
- The resistance should be infinite (O.L.).

Test results OK?

YES
- Go to step 5.
NO
- Repair or replace the wiring.
- Go to step 6.

5. Check on the wiring harness between the control module and the passenger airbag
- Take a resistance reading




- Red feed cable: Control module Airbag: 4




- Black test lead: Car battery: B-.
- The resistance should be infinite (O.L.).

Test results OK?

YES
- Change: Airbag, passenger
- Go to step 6.
NO
- Repair or replace the wiring.
- Go to step 6.

6. Final check




- Clear the diagnostic trouble codes in all systems.
- Perform a driving cycle:
- Drive the car with varying engine loads and at varying engine speeds for five minutes.
- Evaluate the driving cycle:




- Check that the diagnostic trouble code has not recurred.

Test results OK?

YES
- The steps taken to rectify the fault were correct.
NO
- See before changing a control module.