Signal Missing. Permanent Fault

Signal missing. Permanent fault

Checking connector








- Ignition off
- Check air conditioning (A/C) relay connector for contact resistance and oxidation according to Checking wiring and terminals. Permanent fault Checking Wiring and Terminals. Permanent Fault.
- Reinstall components, reconnect connectors etc.
- 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.
If the air conditioning (A/C) relay is now OK it means that the cause of the fault has been loose connections in the connector.

Other information
- To access/replace the air conditioning (A/C) relay, see Integrated relay/fusebox, engine compartment, replacing Integrated Relay/Fusebox, Engine Compartment, Replacing.
- For information about signals, see Signal specification Signal Specifications.













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

Yes - FAULT FOUND

No - Checking wiring and components

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Checking wiring and components
Check air conditioning (A/C) relay resistance. At +20 °C (68°F) the resistance should be approximately 84 ohms. For resistance values see Component specifications Specifications.
Check the signal cable between control module #B44 and air conditioning (A/C) relay #4 and the power supply between system relay #3 and A/C relay #2 for an open-circuit according to Checking wiring and terminals. Permanent fault Checking Wiring and Terminals. Permanent Fault , and a short-circuit to ground according to Checking wiring and terminals. Permanent fault Checking Wiring and Terminals. Permanent Fault.
Remedy as necessary.

Other information
- To connect the breakout box/access the control module, see Connecting the breakout box, B5234T9, B5244T7 Connecting The Breakout Box.
- To access/replace the air conditioning (A/C) relay, see Integrated relay/fusebox, engine compartment, replacing Integrated Relay/Fusebox, Engine Compartment, Replacing.
- For information about signals, see Signal specification Signal Specifications.














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 - Exit fault-tracing

No - Attempt New Test

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Attempt New Test - Checking connector

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