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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. (See Clearing DTCs Procedure) • 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.