Code No. C2253:
EPB SW malfunction
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- If there is any
problem in the CAN bus lines, an incorrect diagnosis code may be set. Prior to this diagnosis,
diagnose the CAN bus lines (Refer to GROUP 54C - CAN Bus Diagnostics Table
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- Whenever ECU is replaced, ensure that the CAN bus lines are normal.
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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 ignition switch, and press the electric parking brake switch
with the brake pedal depressed, the parking brake will be released.
DIAGNOSIS CODE SET CONDITIONS
The diagnosis code will be set under any of the following conditions:
- The ECU detects an open circuit or short to earth 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.
PROBABLE CAUSES
- Damaged wiring harness or connector
- Open or short to earth 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 body earth, or high resistance
in a connector
- The electric parking brake switch seized or poor contact
- Malfunction of the electric parking brake ECU
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STEP 1. M.U.T.-III data list
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Check the following data list (Refer to ).
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- 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
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Q.
Is the check result normal?
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 The trouble can be an intermittent malfunction (Refer to GROUP 00 - How
to Cope with Intermittent Malfunction ).
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 Go to Step 2.
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STEP 2. Check the electric parking brake switch connector.
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Q.
Is the check result normal?
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Go to Step 3.
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Repair the connector. Then go to Step 3.
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STEP 3. Check of short to earth, and open circuit in LCK1, LCK2, REL1or
REL2 line between electric parking brake ECU connector and electric parking brake switch connector
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Q.
Is the check result normal?
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Go to Step 4.
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Repair the connector(s) or wiring harness. Then go to Step 1.
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STEP 4. Measure the resistance at the electric parking brake switch
connector.
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(1)Check the electric parking brake switch connector.
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(2)Disconnect the connector and measure at the wiring harness side.
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(3)Measure the resistance between terminal No.1 and body earth.
OK: Continuity exists (2 Ω or less).
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Q.
Is the check result normal?
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Replace the electric parking brake switch (Refer to ).
Then go to Step 5.
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The earth circuit may be open. Repair the wiring harness wires or connectors between
the electric parking brake switch connector and the body earth. Then go to Step 5.
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STEP 5. Measure the voltage at the electric parking brake switch connector.
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(1)Check the electric parking brake switch connector.
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(2)Disconnect the connector and measure at the wiring harness side.
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(4)Measure the voltage between the terminal No.3 and body earth.
OK: Approximately 4.3 V
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(5)Measure the voltage between the terminal No.2, 9, 10 and body earth.
OK: Approximately battery voltage - 0.7 V
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Q.
Is the check result normal?
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Go to Step 6.
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Replace the electric parking brake ECU (Refer to ).
Then go to Step 6.
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STEP 6. Check whether the diagnosis code is set again.
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Check again if the diagnosis code is set.
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(1)Erase the diagnosis code.
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(2)Turn the ignition switch to the LOCK (OFF) position.
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(3)Turn the ignition switch to the ON position.
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(4)Check if the diagnosis code is set.
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Q.
Is diagnosis code No. C2253 set?
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Replace the electric parking brake ECU (Refer to ).
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The trouble can be an intermittent malfunction (Refer to GROUP 00 - How
to Cope with Intermittent Malfunction ).
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