DTC C1186, C1266

BHE040243000W23

DTC

C1186, C1266

Valve relay

DETECTION CONDITION

• C1186
– DSC HU/CM internal valve relay remains OFF when valve relay ON is commanded.
• C1266
– DSC HU/CM internal valve relay remains ON (stuck) when valve relay OFF is commanded.

POSSIBLE CAUSE

• DSC 30 A fuse malfunction
• Open circuit or short to ground in the wiring harness between the battery and the DSC HU/CM terminal O
• Open or short circuit in the DSC HU/CM internal valve relay, or stuck valve relay
• Poor connection at connectors (female terminal)

Diagnostic procedure

STEP

INSPECTION

ACTION

1

INSPECT ABS FUSE CONDITION

• Is the ABS/DSC 30 A fuse normal?
Yes
Go to the next step.
No
Replace the fuse, then go to Step 3.
2

INSPECT VALVE RELAY POWER SUPPLY FOR OPEN CIRCUIT

• Turn the ignition switch off.
• Disconnect DSC HU/CM connector.
• Turn the ignition switch to the ON position (engine off).
• Measure voltage between DSC HU/CM terminal O (harness-side) and ground.
• Is voltage B+?
Yes
Go to the next step.
No
Repair or replace the wiring harness for open circuit between battery positive terminal and DSC HU/CM terminal O, then go to the next step.
3

VERIFY TROUBLESHOOTING COMPLETED

• Clear the DTC from the memory.
• Is the same DTC present?
Yes
Replace the DSC HU/CM, then go to next step.
No
Go to the next step.
4

VERIFY AFTER REPAIR PROCEDURE

• Are any other DTCs present?
Yes
Go to the applicable DTC inspection.
(See DTC Table.)
No
DTC troubleshooting completed.