DTC C1186 (51), C1266 (52)

BME040243000208

Caution
• When attaching the tester lead to the ABS/TCS HU/CM or ABS HU/CM or the ABS/TCS HU/CM or ABS HU/CM harness connector, the SST (49 G066 001) must be used. (See ABS HU/CM INSPECTION.) (See ABS/TCS HU/CM INSPECTION.)

DTC

C1186 (51), C1266 (52)

Fail-safe relay

DETECTION CONDITION

• C1186 (51): Fail-safe relay in ABS/TCS HU/CM or ABS HU/CM stuck OFF when ignition switch is turned ON, fail-safe relay ON is commanded.
• C1266 (52): Fail-safe relay in ABS/TCS HU/CM or ABS HU/CM stuck ON when ignition switch is turned ON, fail-safe relay OFF is commanded.

POSSIBLE CAUSE

• Open circuit, short to power supply or short to ground circuit of fail-safe relay in ABS/TCS HU/CM or ABS HU/CM
• Stuck ON or OFF of fail-safe relay in ABS/TCS HU/CM or ABS HU/CM
• Open circuit of fail-safe relay power supply circuit

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 3.
2
INSPECT FAIL-SAFE RELAY POWER SUPPLY CIRCUIT FOR OPEN CIRCUIT
• Turn ignition key OFF.
• Disconnect ABS/TCS HU/CM or ABS HU/CM connector.
• Connect SST (adapter harness) to ABS/TCS HU/CM or ABS HU/CM connector (harness side).
• Turn ignition key to ON (engine OFF).
• Measure voltage between terminal AC of SST (adapter harness) and ground.
• Is voltage B+?
Yes
Go to next step.
No
Repair or replace harness for open circuit between battery positive terminal and ABS/TCS HU/CM or ABS HU/CM terminal AC, then go to next step.
3
VERIFY TROUBLESHOOTING COMPLETED
• Make sure to reconnected all disconnected connectors.
• Clear DTC from memory.
• Is same DTC present?
Yes
Replace ABS HU/CM, then go to next step.
No
Go to next step.
4
VERIFY AFTER REPAIR PROCEDURE
• Is there any DTC present?
Yes
Go to applicable DTC inspection.
No
Troubleshooting completed.