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 MANUALSVOLVO2004V70 L5-2.4L VIN 64 B5244S6REPAIR AND DIAGNOSISA L L DIAGNOSTIC TROUBLE CODES ( DTC )TESTING AND INSPECTIONMANUFACTURER CODE CHARTSBCM CODES (BRAKE CONTROL MODULE)BCM-0090FAULTY SIGNAL
2004 Volvo V70 L5-2.4L VIN 64 B5244S6
Faulty Signal
2004 Volvo V70 L5-2.4L VIN 64 B5244S6SECTION Faulty Signal
Faulty signal
Checking the wiring
- Ignition off.
Check the wiring between the active yaw control sensor:
- terminal #1 and control module terminal #A25 (#A25)
- terminal #2 and control module terminal #A29 (#A29)
- terminal #3 and control module terminal #A6 (#A6)
- terminal #5 and control module terminal #A39 (#A39).
check for an open-circuit.
Hint: Read off the relevant signal for the diagnostic trouble code (DTC). Check that the value is within its permitted range.
- Steering wheel angle sensor, offset value. The value must be 0° ±17 °/s.
- Yaw rate sensor, offset value. The value must be 0° ±6.0 °/s.
- Lateral accelerometer, offset value. The value must be 0° ±1.7 m/s.
- Accelerometer, offset value. The value must be 0° ±1.7 m/s.
If the value is incorrect, this can mean a damaged AYC sensor.
Remedy as necessary.
Other information
- To connect the breakout box, see Connecting the breakout box, brake control module (BCM) Connecting the Breakout Box, Brake Control Module (BCM)
- To replace the active yaw control sensor, see Active yaw control sensor, replacing Active Yaw Control Sensor, Replacing
- For information about signals, 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
- Reconnect the connectors, reinstall components etc.
- Test drive the car. See Test Drive Form (DSTC (dynamic stability and traction control) /brake control module), description Test Drive Form (DSTC (Dynamic Stability And Traction Control) /Brake Control Module), Description
- Ignition on.
Read off the status of the diagnostic trouble code (DTC).
Is the status of the diagnostic trouble code (DTC) intermittent?
Yes - VERIFIED
No - VERIFICATION FAILED
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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 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.