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DTC C2253: EPB SW malfunction
 
 
 
 
OPERATION
  • When you pull up the electric parking brake switch with the brake pedal depressed, the parking brake will be applied.
  • When you turn on the power supply mode of the electric motor switch, and press the electric parking brake switch with the brake pedal depressed, the parking brake will be released.
 
 
DTC SET CONDITIONS
The DTC will be set under any of the following conditions:
  • The ECU detects an open circuit or short to ground in the electric parking brake switch circuit.
  • Input signal from lock switch 1 does not correspond to that from lock switch 2.
  • Input signal from release switch 1 does not correspond to that from release switch 2.
 
 
TROUBLESHOOTING HINTS
  • Damaged wiring harness or connector
    • Open or short to ground in the wires between the electric parking brake ECU and the electric parking brake switch, or high resistance in a connector
    • Open in the wires between the electric parking brake switch and ground, or high resistance in a connector
  • The electric parking brake switch seized or poor contact
  • Malfunction of the electric parking brake ECU
 
 
DIAGNOSIS
Required Special Tools:
  • MB992006: Extra Fine Probe
STEP 1. Check whether the DTC is set again.
(1)
cautionTo prevent damage to scan tool (M.U.T.-IIISE), always turn off the power supply mode of the electric motor switch before connecting or disconnecting scan tool (M.U.T.-IIISE).
Connect scan tool (M.U.T.-IIISE). Refer to "How to connect the Scan Tool (M.U.T.-IIISE) ."
(2) Erase the DTC.
(3) Turn off the power supply mode of the electric motor switch.
(4) Turn on the power supply mode of the electric motor switch.
(5) Check if the DTC is set.
Is DTC No. C2253 set?
Go to Step 4.
Go to Step 2.
 
STEP 2. Check whether the DTC is set again.
Check again if the DTC is set.
(1) Turn off the power supply mode of the electric motor switch.
(2) Turn on the power supply mode of the electric motor switch.
(3) Move the selector lever to the P position.
(4) Operate the electric parking brake switch to apply and then release the electric parking brake.
(5) Check if the DTC is set.
Is DTC No. C2253 set?
Go to Step 3.
The trouble can be an intermittent malfunction (GROUP 00 - How to use Troubleshooting/Inspection Service Points - How to Cope with Intermittent Malfunction ).
 
STEP 3. Using scan tool (M.U.T.-IIISE), check data list.
Check the following data list (Refer to ).
  • Item No.2: EPB switch:LOCK 1 SW
  • Item No.3: EPB switch:LOCK 2 SW
  • Item No.4: EPB switch:RELEASE 1 SW
  • Item No.5: EPB switch:RELEASE 2 SW
Is the check result normal?
Go to Step 8.
Go to Step 7.
 
STEP 4. Check of short to ground, and open circuit in LCK1, LCK2, REL1 or REL2 line between electric parking brake ECU connector and electric parking brake switch connector.
Is the check result normal?
Go to Step 5.
Repair the connector(s) or wiring harness.
 
STEP 5. Measure the resistance at the electric parking brake switch connector.
(1) Check the electric parking brake switch connector.
(2) Disconnect the connector and measure at the wiring harness side.
(3) Measure the resistance between terminal No.1 and ground.
OK: The resistance should be 2 ohms or less
Is the check result normal?
Go to Step 6.
The ground circuit may be open. Repair the wiring harness wires or connectors between the electric parking brake switch connector and the ground.
 
STEP 6. Check whether the DTC is set again.
Check again if the DTC is set.
(1) Erase the DTC.
(2) Turn off the power supply mode of the electric motor switch.
(3) Turn on the power supply mode of the electric motor switch.
(4) Check if the DTC is set.
Is DTC No. C2253 set?
Go to Step 7.
The trouble can be an intermittent malfunction (GROUP 00 - How to use Troubleshooting/Inspection Service Points - How to Cope with Intermittent Malfunction ).
 
STEP 7. Check the electric parking brake switch.
Refer to .
Is the check result normal?
Go to Step 8.
Replace the electric parking brake switch (Refer to ).
 
STEP 8. Check whether the DTC is set again.
Check again if the DTC is set.
(1) Erase the DTC.
(2) Turn off the power supply mode of the electric motor switch.
(3) Turn on the power supply mode of the electric motor switch.
(4) Move the selector lever to the P position.
(5) Operate the electric parking brake switch to apply and then release the electric parking brake.
(6) Check if the DTC is set.
Is DTC No. C2253 set?
Replace the electric parking brake ECU (Refer to ).
The trouble can be an intermittent malfunction (GROUP 00 - How to use Troubleshooting/Inspection Service Points - How to Cope with Intermittent Malfunction ).