Signal Too Low. Permanent Fault

Signal too low. Permanent fault

Checking the component




Checking the component

Checking the component








- Ignition off
- Disconnect the battery negative lead
- Disconnect the SIPS bag connector under the seat
- Connect the special tool to the SIPS airbag's connector: 861 8437 SRS adapter C70 ,S70,V70 861 8437 SRS Adapter
- Ignition on
- Connect the battery negative lead.

Warning! There must not be anyone inside the passenger compartment when the battery is connected.

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.

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.

Read off diagnostic trouble codes (DTCs).
If the status of the diagnostic trouble code (DTC) changes from permanent fault to intermittent fault, try replacing the SIPS airbag according to SIPS airbag SIPS Airbag.





Does the status of the diagnostic trouble code (DTC) change?

Yes - inter

No - perm

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perm - Checking components and wiring

inter - Verification

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Checking components and wiring




- Ignition off
- Disconnect special tool 861 8437 SRS adapter C70 ,S70,V70 861 8437 SRS Adapter from the connector for the SIPS bag.
Measure the resistance between the SRS control module:
- terminal #35 (#10) and chassis ground
- terminal #36 (11) and chassis ground.
Also check between the connector under the seat:
- terminal #1 and chassis ground
- terminal #2 and chassis ground.
check for a short-circuit to ground according to Checking wiring and terminals. Permanent fault Checking Wiring and Terminals. Permanent Fault.
The resistance must be below 3.5 kohms.
Remedy as necessary.

Other information:
- To access and replace the control module see SRS control module Removal and Replacement
- To access and replace the SIPS bag, see SIPS airbag SIPS Airbag
- To connect the breakout box, see Connecting the breakout box Connecting The Breakout Box
- For information about signals, see Signal specification Signal Description. Supplementary Restraint System (SRS).









Continue - Verification

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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 status of the diagnostic trouble code (DTC) has changed to intermittent.





Does the status change?

Yes - VERIFIED

No - VERIFICATION FAILED

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VERIFICATION FAILED - Fault-tracing information

VERIFIED - FAULT FOUND

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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 - Exit fault-tracing

No - Attempt New Test

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Attempt New Test - Checking the component

FAULT-TRACING FAILED - No Fault Found

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