Network
generic / SAE
U018A
Lost Communication With Headlamp Leveling Control Module B
ECU lost communication with headlamp leveling control module B (auto-levelling for HID/LED headlamps).
SystemNetwork
Typegeneric / SAE
GroupU0
Range / number1 / 8A
Possible causes
- Module unpowered high
- Gateway module routing CAN messages incorrectly low
- CAN terminating resistor (120 Ω) drifted out of spec low
Symptoms
- Multiple warning lights may illuminate
- Affected modules may go into limp mode or shut down
- Specific functions inoperative depending on module
- Diagnostic tools may show communication faults
Inspection / repair
- Difficulty: easy
- DIY: possible
- Estimated cost: 60–400 €
- Estimated time: 0.3–2 h
- Component: headlamp leveling module b
- Component: can bus
- MIL / check engine light
Sources
References
sae:J2012