ELECTRIC PARKING BRAKE SWITCH INDICATOR LIGHT IS ON OR OFF CONSTANTLY [ELECTRIC PARKING BRAKE (US)]
ELECTRIC PARKING BRAKE SWITCH INDICATOR LIGHT IS ON OR OFF CONSTANTLY [ELECTRIC PARKING BRAKE (US)]
SM2565948
id040328250434
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Troubleshooting item |
Electric parking brake switch indicator light is on or off constantly |
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Description
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• Electric parking brake switch indicator light is on constantly.
• Electric parking brake switch indicator light is off constantly.
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Possible cause
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• Electric parking brake switch connector or terminal malfunction
• Short to ground or open circuit in electric parking brake switch indicator light power supply circuit
• Electric parking brake switch malfunction
• DSC HU/CM connector or terminal malfunction
• Short to ground or open circuit in electric parking brake switch indicator light control circuit
• DSC HU/CM malfunction
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Diagnostic Procedure
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Step |
Inspection |
Results |
Action |
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1
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VERIFY ALL SYSTEM DTCs
• Switch the ignition off.
• Switch the ignition ON (engine off or on) and wait for 10 s or more.
• Perform a DTC inspection using the M-MDS. (See DTC INSPECTION.)
• Are any DTCs displayed?
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Yes
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Repair or replace the malfunctioning part according to the applicable DTC troubleshooting.
(See DTC TABLE [DSC HU/CM (US)].)
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No
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Go to the next step.
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2
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VERIFY IF THE ELECTRIC PARKING BRAKE WARNING LIGHT IS TURNED ON
• Verify if the electric parking brake warning light is turned on.
• Is the electric parking brake warning light turned on?
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Yes
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Perform an inspection referring to “ELECTRIC PARKING BRAKE WARNING LIGHT TURNS ON”.
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No
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Go to the next step.
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3
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INSPECT ELECTRIC PARKING BRAKE SWITCH CONNECTOR CONDITION
• Switch the ignition off.
• Disconnect the negative battery terminal. (See NEGATIVE BATTERY TERMINAL DISCONNECTION/CONNECTION [(US)].)
• Disconnect the electric parking brake switch connector.
• Inspect the connector engagement and connection condition and inspect the terminals for damage, deformation, corrosion, or disconnection.
• Is the connector normal?
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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 connector, and perform the repair completion verification.
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4
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INSPECT ELECTRIC PARKING BRAKE SWITCH INDICATOR LIGHT POWER SUPPLY CIRCUIT FOR SHORT TO GROUND AND OPEN CIRCUIT
• Inspect the power supply circuit for an open circuit and short to ground. (See CIRCUIT INSPECTION.)
• Is the circuit normal?
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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 malfunctioning location, and perform the repair completion verification.
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5
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INSPECT ELECTRIC PARKING BRAKE SWITCH
• Inspect the electric parking brake switch. (See ELECTRIC PARKING BRAKE SWITCH INSPECTION.)
• Is the electric parking 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 electric parking brake switch, and perform the repair completion verification.
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6
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INSPECT DSC HU/CM CONNECTOR CONDITION
• Switch the ignition off.
• Disconnect the negative battery terminal. (See NEGATIVE BATTERY TERMINAL DISCONNECTION/CONNECTION [(US)].)
• Disconnect the DSC HU/CM connector.
• Inspect the connector engagement and connection condition and inspect the terminals for damage, deformation, corrosion, or disconnection.
• Is the connector normal?
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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 connector, and perform the repair completion verification.
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7
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INSPECT ELECTRIC PARKING BRAKE SWITCH INDICATOR LIGHT CONTROL CIRCUIT FOR SHORT TO GROUND AND OPEN CIRCUIT
• Inspect the control circuit for an open circuit and short to ground. (See CIRCUIT INSPECTION.)
• Is the circuit normal?
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Yes
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Replace the DSC HU/CM, and perform the repair completion verification.
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No
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Repair or replace the malfunctioning location, and perform the repair completion verification.
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Repair completion verification
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VERIFY THAT MALFUNCTION SYMPTOMS DO NOT RECUR AFTER REPAIR
• Install/connect the part removed/disconnected during the troubleshooting procedure.
• Has the malfunction symptom been eliminated?
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Yes
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Complete the symptom troubleshooting.
Explain to the customer what has been repaired.
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No
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Refer to the controller area network (CAN) malfunction diagnosis flow to inspect for a CAN communication error.
If the CAN communication is normal, perform the diagnosis from Step 1.
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