DTC C1186, C1266 [DYNAMIC STABILITY CONTROL]

id040220806100

Caution
• When attaching the tester lead to the DSC HU/CM connector the SST (49 G066 004) must be used.

DTC

C1186, C1266

Fail-safe relay

DETECTION CONDITION

• C1186:
- Fail-safe relay in DSC HU/CM stuck OFF when ignition switch is turned ON, fail-safe relay ON is commanded.
• C1266:
- Fail-safe relay in DSC HU/CM stuck ON when ignition switch is turned ON, fail-safe relay OFF is commanded.

POSSIBLE CAUSE

• Malfunction of fuse (ABS 60 A)
• Open circuit in harness between DSC HU/CM terminal C and battery positive terminal
• Open or short of fail-safe relay in DSC HU/CM
• Stuck fail-safe relay in DSC HU/CM

Diagnostic procedure

STEP

INSPECTION

ACTION

1
INSPECT ABS FUSE CONDITION
• Is ABS fuse (60 A) okay?
Yes
Go to next step.
No
Replace fuse, then go to Step 4.
2
INSPECT FAIL-SAFE RELAY POWER SUPPLY CIRCUIT FOR OPEN CIRCUIT
• Turn ignition key to OFF.
• Disconnect DSC HU/CM connector.
• Connect SST (adapter harness) to DSC HU/CM connector (harness side only).
• Turn ignition key to ON (engine OFF).
• Measure voltage between DSC HU/CM terminal C (harness side) of SST and ground.
• Is voltage B+?
Yes
Go to next step.
No
Repair or replace harness for open circuit between battery positive terminal and DSC HU/CM terminal C, then go to Step 4.
4
VERIFY FAIL-SAFE OPERATION
• Turn ignition key to OFF.
• Remove SST (adapter harness) and connect all disconnected connectors.
• Connect WDS or equivalent to DLC-2.
• Turn ignition key to ON (engine OFF).
• Access ABS_POWER using WDS or equivalent.
• Does fail-safe relay operate?
Yes
Go to next step.
No
Replace DSC HU/CM, then go to next step.
5
VERIFY TROUBLESHOOTING COMPLETED
• Clear DTC from memory.
• Is same DTC present?
Yes
Replace DSC HU/CM, then go to next step.
No
Go to next step.
6
VERIFY AFTER REPAIR PROCEDURE
• Is there any other DTC present?
Yes
Go to applicable DTC inspection.
No
Troubleshooting completed.