Communication Fault

Communication fault

Checking wiring and connectors
Check the power supply cable between upper electronic module (UEM) connector terminal #10 and movement sensor connector terminal #1. Check for an intermittent open-circuit. Check for an open-circuit.
Also check both connectors for contact resistance and oxidation.
If no fault was found, try a new sensor.

Other information:
- For further information about signals and other values, see Signal specification Signal Specification, Upper Electronic Module (UEM)
- To connect the breakout box, see Connecting the breakout box Connecting the Breakout Box
- To replace the movement/rear level sensor, see Movement sensor/Volume sensor/ Mass movement sensor (MMS), replace Service and Repair
- To replace the movement/front level sensor (XC90), see
- Checking wiring and terminals Checking Wiring And Terminals.














Continue - Verification

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Verification




Verification

Verification

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








- Ignition off
- Reinstall the connectors, components etc.
Open the driver's door window. Lock the car using the remote control.
Wait 25 seconds until the alarm is active. Trigger the alarm by reaching into the car and unlocking the door from the inside using the internal door handle.

Is the function OK?

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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Attempt New Test - Checking wiring and connectors

FAULT-TRACING FAILED - No Fault Found

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