DTC U300A:29 [ELECTRIC PARKING BRAKE]

id040257256400

Description

Ignition switch status mismatch
Detection condition
•  Electric parking brake control module detects the following mismatches.
―  Condition of IG1 power supply supplied to instrument cluster
―  Condition of IG1 power supply supplied to electric parking brake control module
Fail-safe
Not applicable
Possible cause
•  DTCs are stored in the instrument cluster.
―  Instrument cluster power supply circuit malfunction
―  Instrument cluster malfunction
•  Electric parking brake control module connector or terminal malfunction
•  Electric parking brake control module power supply circuit (IG1) malfunction
―  Short to ground in wiring harness between IG1 relay terminal C and electric parking brake control module terminal R
―  C/U IG1 15 A fuse malfunction
―  Open circuit in wiring harness between IG1 relay terminal C and electric parking brake control module terminal R
•  Electric parking brake control module malfunction

Diagnostic Procedure

Step

Inspection

Action
1
INSPECT ELECTRIC PARKING BRAKE CONTROL MODULE CONNECTOR CONDITION
•  Switch the ignition off.
•  Disconnect the negative battery cable.
•  Disconnect the electric parking brake control module connector.
•  Inspect the connector engagement and connection condition and inspect the terminals for damage, deformation, corrosion, or disconnection.
•  Is the connector normal?
Yes
Go to the next step.
No
Repair or replace the connector, then go to Step 3.
2
VERIFY ELECTRIC PARKING BRAKE CONTROL MODULE POWER SUPPLY (IG1) VOLTAGE
•  Connect the negative battery cable.
•  Switch the ignition ON (engine off or on).
•  Measure the voltage at the electric parking brake control module terminal R (wiring harness-side).
•  Is the voltage B+?
Yes
Go to the next step.
No
Inspect the C/U IG1 15 A fuse.
•  If the fuse is blown:
―  Refer to the wiring diagram and verify whether or not there is a common connector between IG1 relay terminal C and electric parking brake control module terminal R.
If there is a common connector:
•  Determine the malfunctioning part by inspecting the common connector and the terminal for corrosion, damage, or pin disconnection, and the common wiring harness for a short to ground.
•  Repair or replace the malfunctioning part.
If there is no common connector:
•  Repair or replace the wiring harness which has a short to ground.
•  Replace the fuse.
•  If the fuse is damaged:
―  Replace the fuse.
•  If the fuse is normal:
―  Refer to the wiring diagram and verify whether or not there is a common connector between IG1 relay terminal C and electric parking brake control module terminal R.
If there is a common connector:
•  Determine the malfunctioning part by inspecting the common connector and the terminal for corrosion, damage, or pin disconnection, and the common wiring harness for an open circuit.
•  Repair or replace the malfunctioning part.
If there is no common connector:
•  Repair or replace the wiring harness which has an open circuit.
Go to the next step.
3
VERIFY THAT REPAIRS HAVE BEEN COMPLETED
•  Always reconnect all disconnected connectors.
•  Connect the negative battery cable.
•  Clear the DTC for the electric parking brake control module using the M-MDS.
•  Perform the following procedure 3 times or more.
―  Pull up the electric parking brake switch to operate the electric parking brake.
―  Press down the electric parking brake switch to release the electric parking brake.
•  Retrieve the electric parking brake control module DTCs using the M-MDS.
•  Is the same DTC displayed?
Yes
Repeat the inspection from Step 1.
•  If the malfunction recurs, replace the electric parking brake control module.
Go to the next step.
No
Go to the next step.
4
VERIFY IF OTHER DTCs DISPLAYED
•  Are any other DTCs displayed?
Yes
Repair or replace the malfunctioning part according to the applicable DTC troubleshooting.
(See DTC TABLE [ELECTRIC PARKING BRAKE].)
No
DTC troubleshooting completed.