Network
generic or reserved
U356F
Anode Header Drain Valve Heater Relay Control Circuit
Anode Header Drain Valve Heater Relay Control Circuit: the control circuit has an electrical fault.
SystemNetwork
Typegeneric or reserved
GroupU3
Range / number5 / 6F
Possible causes
- Heater relay failed 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: medium
- DIY: shop recommended
- Estimated cost: 100–600 €
- Estimated time: 0.5–2 h
- Component: anode header drain heater relay
- Component: relay wiring
- MIL / check engine light
Sources
References
sae:J2012