Signal Missing - Permanent Fault

Signal missing. Permanent fault

Checking the connector








- Ignition off
- Check the air conditioning (A/C) relay connector. Check for contact resistance and oxidation
- Reinstall the components, reconnect the connectors etc.
- Ignition on
- Activate the air conditioning (A/C) relay.
A " clicking sound" should be heard when the air conditioning (A/C) relay is activated.
If the air conditioning (A/C) relay is now OK, the cause of the fault was loose connections in the connector.

Other information
- For further information about the fuses and relays, see the Wiring Diagram
- For information about signals on 5 cylinder engines, see Signal specification Signal Description / Specification
- For information about signals on 6 cylinder engines, see Signal specification Signal Description / Specification
- Checking wiring and terminals Checking Wiring And Terminals.













Does the air conditioning (A/C) relay function?

Yes - Fault Found

No - Checking components and wiring

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Checking components and wiring
Check the resistance of the air conditioning (A/C) relay. At +20°C the resistance must be approximately 96 ohms between terminals #2 and #4. For the resistance values, see Component specifications Specifications.
Check the signal cable between control module terminal #B44 and air conditioning (A/C) relay terminal #4. Check the power supply between system relay terminal #3 and A/C relay terminal #2. Check for an open-circuit. Check for a short-circuit to ground.
Remedy as necessary.

Other information
- To connect the breakout box / access the control module, see Connecting the breakout box, B5244T5, B5254T2 Connecting the Breakout Box
- For further information about the fuses and relays, see the Wiring Diagram
- For information about signals on 5 cylinder engines, see Signal specification Signal Description / Specification
- For information about signals on 6 cylinder engines, see Signal specification Signal Description / Specification
- Checking wiring and terminals Checking Wiring And Terminals.














Continue - Verification

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Verification




Verification

Hint: After carrying out the repair, check that the fault has been remedied.








- Ignition off.
- Reconnect connectors, reinstall components
- Ignition on.
- Activate air conditioning (A/C) relay.
An "clicking sound" should be heard from the air conditioning (A/C) relay when it is activated.









Does the air conditioning (A/C) relay function?

Yes - VERIFIED

No - VERIFICATION FAILED

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VERIFICATION FAILED - Fault-tracing information

VERIFIED - Fault Found

FAULT-TRACING FAILED - No 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 - FAULT-TRACING FAILED

No - Attempt New Test

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FAULT-TRACING FAILED - FAULT-TRACING FAILED

Attempt New Test - Checking the connector

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