DTC C1446
id040200803400
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DTC
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C1446
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Brake light switch
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DETECTION CONDITION
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• ON signal is input from the brake switch for 6 min or more while the vehicle is driving at a vehicle speed of 20 km/h {12.4 mph} or more.
• ON signal is not input from the brake switch though the ABS HU/CM determines that the vehicle is decelerating.
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POSSIBLE CAUSE
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• Malfunction of brake switch
• Open or short circuit in harness between ABS HU/CM terminal V and brake light switch
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Diagnostic procedure
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STEP |
INSPECTION |
ACTION |
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1
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INSPECT BRAKE LIGHT SWITCH SIGNAL CIRCUIT FOR OPEN CIRCUIT
• Turn ignition key to OFF.
• Disconnect ABS HU/CM connector.
• Measure continuity between ABS HU/CM terminal V (harness side) and brake light switch.
• Is there continuity?
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Yes
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Go to next step.
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No
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Repair or replace harness for open circuit between brake light switch and ABS HU/CM terminal V, then go to Step 4.
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2
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INSPECT BRAKE LIGHT SWITCH SIGNAL CIRCUIT FOR SHORT TO POWER CIRCUIT
• Measure voltage between ABS HU/CM terminal V (harness side) and ground.
• Is voltage B+?
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Yes
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Repair or replace harness for short to power circuit between brake light switch and ABS HU/CM terminal V, then go to Step 4.
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No
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Go to next step.
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3
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INSPECT BRAKE LIGHT SWITCH
• Inspect brake light switch.
• Is it normal?
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Yes
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Go to next step.
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No
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Replace brake light switch, then go to next step.
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4
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VERIFY TROUBLESHOOTING COMPLETED
• Clear DTC from memory.
(See ABS ON-BOARD DIAGNOSIS.)
• Start engine and drive vehicle at 10 km/h {6.2 mph} or above.
• Gradually slow down and stop vehicle.
• Is same DTC present?
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Yes
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Repeat the inspection from Step 1.
If the malfunction recurs, replace the ABS CM, then go to next step.
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No
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Go to next step.
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5
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VERIFY AFTER REPAIR PROCEDURE
• Is there any other DTC present?
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Yes
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Go to applicable DTC inspection.
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No
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Troubleshooting completed.
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