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DTC 31

BME010266350206

DTC 31 | Brake switch
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DETECTION CONDITION | • Voltage detected at cruise actuator connector terminal C is not approximately 12 V or voltage detected at cruise actuator connector terminal K is not approximately 0 V.
POSSIBLE CAUSE | • Burnt STOP 15 A fuse • Cruise actuator malfunction • Brake switch and/or brake switch 2 malfunction • Open circuit in wiring harness between STOP 15 A fuse and brake switch • Open circuit in wiring harness between brake switch and cruise actuator terminal C
• Short circuit in wiring harness between brake switch 2 and cruise actuator terminal K

Diagnostic procedure

STEP | INSPECTION | ACTION
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1 | VERIFY WHICH BRAKE SWITCH CIRCUIT IS MALFUNCTIONING • Does brake light illuminate when brake pedal depressed? | Yes | Go to Step 6.
No | Go to next step.
2 | INSPECT STOP 15 A FUSE FOR FUSION • Is STOP 15 A fuse okay? | Yes | Go to next step.
No | Replace fuse after inspecting and repairing wiring harness.
* 3 | INSPECT WIRING HARNESS BETWEEN STOP 15 A FUSE AND BRAKE SWITCH FOR CONTINUITY • Depress brake pedal. • Is voltage at brake switch connector terminal 1B approximately 12 V? | Yes | Go to Step 5.
No | Go to next step.
* 4 | INSPECT WIRING HARNESS BETWEEN STOP 15 A FUSE AND BRAKE SWITCH FOR CONTINUITY • Is voltage at brake switch connector terminal 1A approximately 12 V? | Yes | Inspect brake switch. (See BRAKE SWITCH INSPECTION)
No | Repair wiring harness. (STOP 15 A fuse-Brake switch)
* 5 | INSPECT WIRING HARNESS BETWEEN BRAKE SWITCH AND BRAKE LIGHT FOR CONTINUITY • Depress brake pedal. • Is voltage at brake light connector terminal (power supply side) approximately 12 V? | Yes | Inspect following electrical parts. • Brake light bulb • Wiring harness between brake light and ground
No | Repair wiring harness. (Brake switch-Brake light)
* 6 | INSPECT WIRING HARNESS BETWEEN BRAKE SWITCH AND CRUISE ACTUATOR FOR CONTINUITY • Remove left-side front side trim. (See FRONT SIDE TRIM REMOVAL/INSTALLATION) • Depress brake pedal. • Is voltage at cruise actuator connector terminal C approximately 12 V? | Yes | Go to next step.
No | Repair wiring harness. (Cruise actuator-Brake switch)
* 7 | VERIFY WHICH IS MALFUNCTIONING CRUISE ACTUATOR AND WIRING HARNESS (BRAKE SWITCH 2 AND CRUISE ACTUATOR) OR BRAKE SWITCH 2 • Disconnect brake switch 2 connector. • Turn ignition switch ON position. • Is voltage at brake switch 2 connector terminal 2B approximately 12 V? | Yes | Go to next step.
No | Inspect brake switch 2. (See BRAKE SWITCH INSPECTION)
* 8 | INSPECT WIRING HARNESS BETWEEN BRAKE SWITCH 2 AND CRUISE ACTUATOR FOR SHORT TO POWER SUPPLY • Turn ignition switch to LOCK position. • Connect brake switch 2 connector. • Disconnect cruise actuator connector. • Turn ignition switch ON position.
• Is voltage at cruise actuator connector terminal K approximately 12 V?
Yes
Replace cruise actuator.
(See CRUISE ACTUATOR REMOVAL/INSTALLATION)
No | Repair wiring harness. (Cruise actuator-Brake switch 2)