Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSVOLVO2007XC90 AWD L6-3.2L VIN 98 B6324SREPAIR AND DIAGNOSISA L L DIAGNOSTIC TROUBLE CODES ( DTC )TESTING AND INSPECTIONMANUFACTURER CODE CHARTSREM CODES (REAR ELECTRONIC MODULE)REM-DD21FAULTY SIGNAL
2007 Volvo XC90 AWD L6-3.2L VIN 98 B6324S
Faulty Signal
2007 Volvo XC90 AWD L6-3.2L VIN 98 B6324SSECTION Faulty Signal
Faulty signal
Checking the wiring
- Ignition off
- Disconnect connector D on the rear electronic module (REM).
The diagnostic trouble code (DTC) is stored if there is no communication between the rear electronic module (REM) and the inclination sensor module (ISM). This may be due to a fault in the signal cable between the control modules or a defective communication device in one or all of the control modules.
Check the signal cable. Check for an open-circuit. Check for a short-circuit to ground. Check for a short-circuit to supply voltage.
Take readings between:
- Rear electronic module (REM) terminal #D26 (#26) and the inclination sensor module (ISM) terminal #2.
Remedy as necessary.
Other information
- Connecting the breakout box Connecting Breakout Box, Rear Electronic Module (REM)
- Signal specification Signal Specification, Rear Electronic Module (REM)
- Tilt sensor alarm, replacing Service and Repair
- Checking wiring and terminals Checking Wiring and Terminals
Was a fault detected?
Yes - Verification
No - Replacing the control module
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Replacing the control module
Try a new inclination sensor module (ISM).
Remedy as necessary.
Other information
- Tilt sensor alarm, replacing Service and Repair
Continue - Verification
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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 alarm.
Check that the functions are OK.
Are the functions OK?
Yes - Troubleshooting procedure complete
No - 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 - Exit Fault-tracing
No - Attempt New Test
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Attempt New Test - Checking the wiring
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.