Signal Too Low - Permanent Fault

Signal too low. Permanent fault

Checking connector








- Ignition off
- Check wiring and connectors 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.
- Read off outside temperature.
If the temperature is now within its permitted range, the fault was caused by loose connections in the connector.

Other information
- To access/replace the outside temperature sensor see Outside temperature sensor door mirror, replacing Outside Temperature Sensor Door Mirror, Replacing.













Is the temperature within its permitted range?

Yes - Fault Found

No - Checking wiring and components

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Checking wiring and components
Check outside temperature sensor resistance.

Note! The outside temperature sensor can be defective if the signal cable has been short-circuited to supply voltage. Check this before replacing the sensor.

Check signal cable between control module #B29 (#B39) and outside temperature sensor #1 for an intermittent open-circuit according to Checking wiring and terminals. Permanent fault Checking Wiring and Terminals. Permanent Fault and a short-circuit to supply voltage according to Checking wiring and terminals. Permanent fault Checking Wiring and Terminals. Permanent Fault.

Hint: With the ignition on and the outside temperature sensor connector disconnected, the voltage between #1 and ground should be approximately 5 V.

Check the ground lead between control module #B2 (#B12) and the outside temperature sensor #2 for an open-circuit according to Checking wiring and terminals. Permanent fault Checking Wiring and Terminals. Permanent Fault.
Remedy as necessary.

Other information
- Connecting the breakout box/accessing the control module, see Connecting the breakout box, B5244T5, B5254T2 Connecting the Breakout Box.
- To access/replace the outside temperature sensor see Outside temperature sensor door mirror, replacing Outside Temperature Sensor Door Mirror, Replacing
- For resistance values, see Component specifications Specifications.
- For information about signals, see Signal specification Signal Specification, ECM.














Continue - Verification

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Verification




Verification

Verification

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








- Ignition off.
- Reconnect connectors, reinstall components.
- Ignition on.
- Read off outside temperature.





Is the temperature within its permitted range?

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 - FAULT-TRACING FAILED

No - Attempt New Test

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FAULT-TRACING FAILED - FAULT-TRACING FAILED

Attempt New Test - Checking connector

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