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DTC B1483, B1484, B1486 [DSC]

id040220874700

DTC | B1483, B1484, B1486 | Brake switch signal
DETECTION CONDITION | • B1483 - A signal error is input for 5 s or more from the brake switch. • B1484 - The brake switch on signal is input continuously for 120 s or more under the specified driving conditions. • B1486 - The brake switch off signal is input continuously for 150 s or more even with 1.5 MPa or more of brake fluid pressure.
POSSIBLE CAUSE | • B1483 - Malfunction of brake switch • B1484 - Short to power circuit in wiring harness between the brake switch and PCM terminal • B1486 - Short to ground circuit in wiring harness between the brake switch and PCM terminal - Open circuit in wiring harness between the brake switch and PCM terminal

Diagnostic procedure

STEP | INSPECTION | ACTION
--- | --- | ---
1 | VERIFY OPEN OR SHORT CIRCUIT IN BRAKE SWITCH SIGNAL • Turn the ignition switch to the ON position. • Measure the voltage between the following PCM connector terminals and body ground when the brake pedal is depressed and released. - PCM (L8, LF, L3): 1AB - PCM (L3 Turbo): 1K - PCM (MZR-CD (RF Turbo)): 100 Voltage Brake pedal depressed: B+ Brake pedal released: 1 V or less | Yes | Go to Step 5.
No | If it is B+ under any condition, then go to the next step. If it is 1 V or less under any condition, then go to Step 3.
2 | INSPECT BRAKE SWITCH SIGNAL FOR SHORT TO POWER SUPPLY CIRCUIT • Disconnect the brake switch connector. • Measure the voltage between the brake switch connector terminal D (vehicle harness-side) and body ground. • Is the voltage 1 V or less? | Yes | Go to Step 4.
No | Repair or replace the wiring harness between the PCM and brake switch, then go to Step 5.
3 | INSPECT BRAKE SWITCH SIGNAL FOR OPEN CIRCUIT • Disconnect the PCM connectors. • Disconnect the brake switch connector. • Inspect continuity between the following PCM connector terminals (vehicle harness-side) and brake switch terminal D. - PCM (L8, LF, L3, L3 Turbo): 1AB - PCM (L3 Turbo): 1K - PCM (MZR-CD (RF Turbo)): 100 • Is there continuity? | Yes | Go to the next step.
No | Repair or replace the wiring harness between the PCM and brake switch, then go to Step 5.
4 | INSPECT BRAKE SWITCH • Inspect the brake switch. (See BRAKE SWITCH INSPECTION.) • Is the brake switch normal? | Yes | Go to the next step.
No | Replace the brake switch, then go to the next step. (See BRAKE PEDAL REMOVAL/INSTALLATION.)
5 | VERIFY THAT THE SAME DTC IS NOT PRESENT • Reconnect all disconnected connectors. • Clear the DTCs from the memory. (See Clearing DTCs Procedures.) • Are the same DTCs present? | Yes | Repeat the inspection from Step 1. If the malfunction recurs, replace the DSC HU/CM, then go to the next step. (See DSC HU/CM REMOVAL/INSTALLATION [2WD (MTX), 4WD (ATX)].) (See DSC HU/CM REMOVAL/INSTALLATION [2WD (ATX), 4WD (MTX)].)
No | Go to the next step.
6 | 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.