DTC B1484, C1954 [DYNAMIC STABILITY CONTROL (DSC)]
id0402b2800500
DTC
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B1484, C1954
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Brake switch system
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DETECTION CONDITION
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• B1484
• C1954
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FAIL-SAFE
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• Inhibits ABS, TCS, and DSC controls, and illuminates ABS warning light, DSC indicator light and brake system warning light (vehicle without the malfunction warning light)* / malfunction warning light (vehicle equipped with the malfunction warning light)*.
(If error is detected during ABS/TCS control, inhibits ABS/TCS control after finishing the control and illuminates ABS warning light.)
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POSSIBLE CAUSE
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• STOP 10 A fuse malfunction
• Brake switch malfunction
• Brake light noise filter malfunction
• Open circuit or short to ground in the wiring harness between the DSC HU/CM terminal N and the brake switch terminal D
• Brake light malfunction
• High-mount brake light malfunction
• Brake fluid pressure sensor malfunction in DSC HU/CM
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Diagnostic procedure
STEP |
INSPECTION |
ACTION |
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1
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INSPECT BRAKE PEDAL POSITION SIGNAL INPUT TO DSC HU/CM USING M-MDS
• Connect the M-MDS to the DLC-2.
• Select the “BOO_ABS” PID and verify that the display is switched as follows according to the brake pedal condition:
• Does the “BOO_ABS” PID change normally?
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Yes
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Go to Step 6.
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No
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Go to the next step.
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2
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INSPECT STOP LIGHT FUSE CONDITION
• Turn the ignition switch off.
• Inspect the STOP 10 A fuse.
• Is the STOP 10 A fuse normal?
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Yes
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Go to the next step.
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No
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Replace the fuse, then go to Step 7.
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3
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INSPECT BRAKE SWITCH
• Inspect the brake switch.
(See BRAKE SWITCH INSPECTION.)
• Is the brake switch normal?
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Yes
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Go to the next step.
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No
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Replace the brake switch, then go to Step 7.
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4
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INSPECT BRAKE LIGHT NOISE FILTER
• Inspect the brake light noise filter.
(See NOISE FILTER INSPECTION.)
• Is the brake light noise filter normal?
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Yes
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Go to the next step.
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No
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Replace the wiring harness (including the brake light noise filter), then go to Step 7.
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5
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INSPECT FOR OPEN CIRCUIT IN WIRING HARNESS BETWEEN DSC HU/CM AND STOP LIGHT FUSE
• Disconnect the DSC HU/CM, brake switch, and brake light noise filter connectors.
• Inspect the vehicle wiring harness-side connectors for continuity between the following terminals:
• Is there continuity?
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Yes
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Go to the next step.
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No
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Repair or replace the wiring harness for open circuit between brake switch, brake light noise filter and DSC HU/CM, then go to Step 7.
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6
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INSPECT BRAKE FLUID PRESSURE SENSOR
• Inspect the brake fluid pressure sensor.
• Is the brake fluid pressure sensor normal?
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Yes
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Go to the next step.
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No
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Replace the DSC HU/CM, then go to the next step.
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7
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VERIFY DTC TROUBLESHOOTING COMPLETED
• Make sure to reconnect all disconnected connectors.
• Clear the DTC from the memory.
• Start the engine and drive the vehicle at 20 km/h {13 mph} or more for 60 s or more.
• Are the same DTCs present?
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Yes
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Repeat the inspection from Step 1.Replace the DSC HU/CM, then go to the next step.
If the malfunction recurs, replace the DSC HU/CM, then go to the next step.
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No
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Go to the next step.
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8
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VERIFY AFTER REPAIR PROCEDURE
• Are any other DTCs present?
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Yes
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Go to the applicable DTC inspection.
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No
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DTC troubleshooting completed.
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