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.
2007 Volvo XC70FACTORY OEM SERVICE PROCEDURE
Headlamp Control Module (HCM) DTCS
HEADLAMP CONTROL MODULE (HCM) - DTC INDEX
| DTC | Description |
|---|---|
| HCM-0141 | Control module. Internal fault |
| HCM-0317 | Battery voltage. Voltage too high |
| HCM-2281 | Communication, Central Electronic Module (CEM). Signal missing |
| HCM-2687 | Communication with SAS control module. Signal missing |
| HCM-2987 | Communication with BCM control module. Signal missing |
| HCM-4076 | Lamp unit Wrong mounting position |
| HCM-6401 | Left headlamp swivelling motor circuit Faulty signal |
| HCM-6411 | Left-hand lamp module (LHCU) Voltage too low |
| HCM-6477 | Left headlamp swivelling motor circuit Commanded position not reachable |
| HCM-6501 | Right headlamp swivelling motor circuit Faulty signal |
| HCM-6511 | Rright-hand lamp module (RHCU) Voltage too low |
| HCM-6577 | Right headlamp swivelling motor circuit Commanded position not reachable |
| HCM-DD00 | Communication with left-hand lamp module (LHCU) Faulty signal |
| HCM-DD01 | Communication with left-hand lamp module (LHCU) Signal missing |
| HCM-DD02 | Communication with left-hand lamp module (LHCU) Faulty signal |
| HCM-DD10 | Communication with left-hand lamp module (LHCU) Signal missing |
| HCM-DD20 | Communication with right-hand lamp module (RHCU) Faulty signal |
| HCM-DD21 | Communication with right-hand lamp module (RHCU) Signal missing |
| HCM-DD22 | Communication with right-hand lamp module (RHCU) Faulty signal |
| HCM-DD30 | Communication with right-hand lamp module (RHCU) Signal missing |
| HCM-E000 | Control module communication. Faulty communication |
| HCM-E003 | Configuration fault. Faulty configuration |
| HCM-E010 | Control module. Voltage too low |
Factory Service Tools
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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.
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