Signal Too Low

Signal too low

Checking the status




- Ignition on.
Activate the stop lamp.
Check if the fault is permanent or intermittent.
The stop lamp must light on activation.
The fault is permanent if the stop lamp does not activate.
If the stop lamp is activated, this is an indication that the fault was present previously but that it is not active at the moment, i.e. the fault is intermittent.






Continue - Checking components and wiring

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Checking components and wiring
Check the voltage between the left and right-hand stop lamps and the output on the rear electronic module (REM). The voltage must be approximately 12 V when the stop lamp is activated.
Check the control signal cable. Check for a short-circuit to ground.
Take readings between:
S60
- Rear electronic module (REM) terminal #B3 (#3) and stop lamp terminal #B4.
S80
- Rear electronic module (REM) terminal #D18 (#18) and stop lamp terminal #7.
V70/XC70
- Rear electronic module (REM) terminal #B3 (#3) and stop lamp terminal #B2.
XC90
- Rear electronic module (REM) terminal #B3 (#3) and stop lamp terminal #A5.
Check the cable between central electronic module (CEM) terminal #A15 (15) and rear electronic module (REM) terminal #A18 (18). Check for a short-circuit to ground.
Remedy as necessary.

Other information
- Central electronic module (CEM): Connecting the breakout box Connecting the Breakout Box, Central Electronic Module (CEM)
- Rear electronic module (REM): Connecting the breakout box Connecting Breakout Box, Rear Electronic Module (REM)
- Central electronic module (CEM): Signal specification Pinout Values and Diagnostic Parameters
- Rear electronic module (REM): Signal specification Signal Specification, Rear Electronic Module (REM)
- Central electronic module (CEM), replacing Central Electronic Module (CEM), Replacing
- Integrated relay / fusebox cargo compartment / rear electronic module, replacing Integrated Relay/Fusebox Cargo Compartment/Rear Electronic Module (REM), Replacing
- Stop lamp high mounted, replacing Stop Lamp, Rear Windshield, Replacing
- 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.
- Ignition on
- Activate the stop lamps.
Check that the stop lamps are working.





Are the stop lamps working?

Yes - VERIFIED

No - VERIFICATION FAILEDPAPER

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VERIFIED - Fault Found

VERIFICATION FAILED - Fault-tracing information

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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 components and wiring

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