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 CHARTSCEM CODES (CENTRAL ELECTRONIC MODULE)CEM-8A21SIGNAL TOO LOW
2007 Volvo XC90 AWD L6-3.2L VIN 98 B6324S
Signal Too Low
2007 Volvo XC90 AWD L6-3.2L VIN 98 B6324SSECTION Signal Too Low
Signal too low
Checking the wiring
- Ignition off
- Disconnect central electronic module (CEM) connector B.
Check the power cable for a short-circuit to ground.
For S60, V70, S80 with Bi-Xenon and XC90
Take readings between:
- Central electronic module (CEM) terminal #B4 (#B4) and right-hand stop lamp connector terminal #A2.
For S80 without Bi-Xenon
Take readings between:
- Central electronic module (CEM) terminal #B4 (#B4) and right-hand lamp housing connector terminal #A3.
Remedy as necessary.
Other information
- Connecting the breakout box Connecting the Breakout Box, Central Electronic Module (CEM)
- Signal specification Signal Specification
- Location of components Component Location, Central Electronic Module (CEM)
- Checking wiring and terminals Checking Wiring and Terminals
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.
Set the light switch to low beam.
Check that low beam is activated.
Is low beam activated?
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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RENDER: 1.0x
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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.