DTC 1B - Electric Detonator 1 Short to Battery Positive

MALFUNCTION
DTC 1b L: Electric detonator 1 shorting to battery positive

DIAGNOSTIC PROCEDURE
1. Unscrew the steering wheel center pad (airbag module) and unplug the connector at the rear of the airbag. Plug reference resistor 84 71 153 into the connector.
2. Unplug connector 59 and plug test cable 84 71 146 into the connector. Use an ohmmeter to measure the resistance between each pin and battery positive.

NOTE: Switch ON the ignition and turn the steering wheel from full lock to full lock a few times during each measurement.

CAUTION: To prevent damaging the ohmmeter when resistance measurement to battery positive is carried out, do not ground it.

If any reading is 5,100 ohms or lower - proceed to step 2.
If all readings are higher than 5,100 ohms, proceed to step 3.
3. Unplug connector 335.
4. Take the same readings as described in 2.
If any reading is 5,1OO ohms or lower, the fault is in the wiring between connectors 335 and 59. Investigate the cause. Rectify the fault or change the wiring as necessary.
If all readings are higher than 5,100 ohms, the fault could be in the contact unit which should then be changed. Proceed to step 5.
5. Change the contact unit, plug in all connectors. Clear the code and wait at least 40 seconds with the ignition switched ON. Check whether the trouble code persists.
If the trouble code persists, the fault could be in the wiring between connector 59 and the control module. Investigate the cause. Rectify the fault or change the control module as necessary. Before changing the control module, Programming and Relearning