DTC C1139:64 [DSC HU/CM]
id040262848900
DTC
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C1139:64
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AUTO HOLD switch
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DETECTION CONDITION
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• Continuous ON signal from the AUTO HOLD switch for 30 s or more is detected.
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FAIL-SAFE FUNCTION
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• Refer to “Fail-safe function table”. (See DTC TABLE [DSC HU/CM].)
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POSSIBLE CAUSE
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• Short to ground in the wiring harness between the electric parking brake control module terminal W and AUTO HOLD switch terminal D
• AUTO HOLD switch malfunction
• Electric parking brake control module malfunction
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SYSTEM WIRING DIAGRAM
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Not applicable
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Diagnostic Procedure
Step |
Inspection |
Action |
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1
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ASK CUSTOMER IF AUTO HOLD SWITCH HAS BEEN PRESSED DOWN CONTINUOUSLY FOR 30 S OR MORE
• Ask the customer if the AUTO HOLD switch has been pressed down continuously for 30 s or more.
• Has the AUTO HOLD switch been pulled up/pressed down continuously for 30 s or more?
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Yes
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System is normal. (Explain to the customer that it is not necessary to continuously press down the AUTO HOLD switch to operate/release the AUTO HOLD system.)
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No
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Go to the next step.
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2
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INSPECT AUTO HOLD SWITCH
• Visually verify the AUTO HOLD switch for the following.
• Is the AUTO HOLD 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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Interference with surrounding parts:
• Install the AUTO HOLD switch correctly.
• Go to the next step.
Foreign matter has penetrated movable parts:
• Remove the foreign matter, then go to the next step.
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3
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INSPECT AUTO HOLD SWITCH SIGNAL CIRCUIT FOR SHORT TO GROUND
• Disconnect the AUTO HOLD switch.
• Disconnect the electric parking brake control module connector.
• Inspect for continuity between the AUTO HOLD switch connector terminal D (vehicle harness-side) and body ground.
• Is there continuity?
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Yes
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Repair or replace the wiring harness, then go to Step 4.
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No
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Go to the next step.
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4
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VERIFY THAT REPAIRS HAVE BEEN COMPLETED
• Clear the DTC for the DSC HU/CM using the M-MDS.
(See CLEARING DTC [DSC HU/CM].)
• Perform the following procedure 3 times or more.
• Retrieve the DSC HU/CM DTCs using the M-MDS.
(See DTC INSPECTION [DSC HU/CM].)
• Is the same DTC displayed?
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Yes
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Repeat the inspection from Step 1.
• If the malfunction recurs, replace the electric parking brake control module.
Go to the next step.
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No
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Go to the next step.
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5
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VERIFY IF OTHER DTCs DISPLAYED
• Are any other 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].)
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No
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DTC troubleshooting completed.
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