Signal Too Low
Signal too low. Permanent fault
Checking the component
- Ignition off
- Disconnect the (green) connector from the airbag on the passenger side
- Connect special tool951 1506 Test dummy 951 1506 Test Dummy to the airbag connector (green) on the passenger side
Warning! Under no circumstances use an ohmmeter or other live measuring instrument to take readings from a disconnected, non-deployed airbag module. This could deploy the airbag!
Note! The special tool must be checked and fault-free. If the tool is defective, the diagnosis readings will be incorrect. This will make fault-tracing harder.
- Switch on the ignition. Wait 10 seconds.
Read off diagnostic trouble codes (DTCs).
Try a new airbag on the passenger side if the diagnostic trouble code (DTC) changes status from a permanent to an intermittent fault.
Other information:
- To access or replace the airbag on the passenger side, see Airbag passenger (SRS), replacing Airbag Passenger (SRS), Replacing
- To check the special tool, see Calibration Calibrating the Special Tool.
Does the status of the diagnostic trouble code (DTC) change?
Yes - Verification
No - Checking components and wiring
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Checking components and wiring
- Ignition off
- Disconnect special tool951 1506 Test dummy 951 1506 Test Dummy from the airbag connector (green) on the passenger side.
Warning! Under no circumstances use an ohmmeter or other live measuring instrument to take readings on a disconnected, non-deployed, pyrotechnical airbag. This could deploy the airbag!
Caution! Do not touch the terminal pins in the SRS control module. There is a risk of static discharge. This could damage the SRS control module.
Check the cable between SRS control module terminal #12B (40) and connector (green) terminal #1 on the passenger side airbag for a short-circuit to ground according to Checking wiring and terminals. Permanent fault Checking Wiring and Terminals. Permanent Fault.
Check the cable between SRS control module terminal #11B (39) and connector (green) terminal #3 on the passenger side airbag for a short-circuit to ground according to Checking wiring and terminals. Permanent fault Checking Wiring and Terminals. Permanent Fault.
Other information:
- To access and replace the SRS control module and connector, see Control module SRS (supplemental restraint system), replacing Service and Repair
- To access the connector (green) for the passenger airbag, see Airbag passenger (SRS), replacing Airbag Passenger (SRS), Replacing
- To connect the breakout box, see Connecting the breakout box Connecting the Breakout Box, Supplemental Restraint System Module (SRS)
- With the ignition off and the 4-pin connector and the connector for the control module disconnected, the resistance between terminals #1 and #2 on the 4-pin connector (SRS control module side) and ground should be infinite
- To replace the wiring, see Cable harness SRS system, repair Procedures
- For other values, see Signal specification Signal Specification, Supplemental Restraint System Module (SRS).
Continue - Verification
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Fault-tracing information
Information
Fault-tracing information
The fault should have been detected and remedied. As this is not the case fault-tracing has failed.
Exit fault-tracing for this diagnostic trouble code (DTC) or make another attempt.
Do you want to exit fault-tracing?
Yes - FAULT-TRACING FAILED
No - Attempt New Test
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FAULT-TRACING FAILED - No Fault Found
Attempt New Test - Checking the component
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Verification
Verification
Verification
Hint: After carrying out the repair, check that the fault has been remedied.
- Ignition off
- Disconnect the battery negative lead
- Reinstall the connectors, components etc.
- Ignition on
- Connect the battery negative lead.
Warning! There must not be anyone inside the passenger compartment when the battery is connected.
- Read off diagnostic trouble codes (DTCs).
The fault is no longer present if the diagnostic trouble code (DTC) status is intermittent.
Is the diagnostic trouble code (DTC) intermittent?
Yes - VERIFIED
No - VERIFICATION FAILED
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VERIFIED - Fault Found
VERIFICATION FAILED - Fault-tracing information
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