Code No. 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 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. 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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 Go to Step 4.
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 Go to Step 2.
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STEP 2. 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)Turn the ignition switch to the LOCK (OFF) position.
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(2)Turn the ignition switch to the ON position.
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(3)Move the selector lever to the P position.
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(4)Operate the electric parking brake switch to apply and then release the electric
parking brake.
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(5)Check if the diagnosis code is set.
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Q.
Is diagnosis code No. C2253 set?
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Go to Step 3.
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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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STEP 3. 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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Go to Step 8.
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Go to Step 7.
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STEP 4. Check of short to earth, and open circuit in LCK1, LCK2, REL1
or 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 5.
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Repair the connector(s) or wiring harness.
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STEP 5. 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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Go to Step 6.
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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.
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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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Go to Step 7.
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This diagnosis is complete.
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STEP 7. Check the electric parking brake switch.
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Refer to .
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Q.
Is the check result normal?
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Go to Step 8.
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Replace the electric parking brake switch (Refer to ).
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STEP 8. 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)Move the selector lever to the P position.
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(5)Operate the electric parking brake switch to apply and then release the electric
parking brake.
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(6)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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This diagnosis is complete.
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