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DTC B1627 [DSC]

id040220874800

DTC | B1627 | Reverse signal
DETECTION CONDITION | • Reverse signal is input for 10 s or more while driving at a vehicle speed of 65 km/h {40 mph}
POSSIBLE CAUSE | • Short to power circuit in harness between DSC HU/CM terminal Z and back-up light switch (MTX) • Malfunction of back-up light switch (MTX) or TR switch (ATX)

Diagnostic procedure

STEP | INSPECTION | ACTION
--- | --- | ---
1 | INSPECT TR SWITCH FOR DTCs (ATX) • Turn ignition key to OFF. • Connect WDS or equivalent to DLC-2. • Turn ignition key to ON (engine OFF). • Is DTC for TR switch obtained? | Yes | Follow inspection procedures for TR switch.
No | Go to step 4.
2 | INSPECT BACK-UP LIGHT SWITCH (MTX) • Inspect back-up light switch. (See BACK-UP LIGHT SWITCH INSPECTION.) • Is it normal? | Yes | Go to next step.
No | Replace back-up light switch, then go to next step. (See BACK-UP LIGHT SWITCH REMOVAL/INSTALLATION.)
3 | INSPECT REVERSE SIGNAL CIRCUIT FOR SHORT TO POWER (MTX) • Shift select lever to neutral position. • Turn ignition key to ON. • Measure voltage between DSC HU/CM terminal Z and ground. • Is voltage above 10 V? | Yes | Go to next step.
No | Replace back-up light switch, then go to next step. (See BACK-UP LIGHT SWITCH REMOVAL/INSTALLATION.) Replace reverse signal circuit, then go to next step.
4 | VERIFY TROUBLESHOOTING COMPLETED • Clear DTC from memory. (See Clearing DTCs Procedures.) • Is same DTC present? | Yes | Replace DSC HU/CM, then go to next step.
No | Go to next step.
5 | VERIFY THAT NO OTHER DTCS ARE PRESENT • Are any other DTCs output? | Yes | Go to the applicable DTC inspection. (See DTC Table.)
No | DTC troubleshooting completed.