Code No. C2254:
IG SW malfunction
OPERATION
The IG1 signal is delivered from the ETACS-ECU (IG1 relay) through the multi-purpose fuse
to the electric parking brake ECU.
DIAGNOSIS CODE SET CONDITIONS
If the IG1 signal circuit remains open or short to earth for at least three seconds, the
diagnosis code will be set.
PROBABLE CAUSES
- Damaged wiring harness or connector
- Open or short to earth in the wires between the ETACS-ECU and the electric
parking brake ECU, or high resistance in a connector
- Blown fuse
- Malfunction of the electric parking brake ECU
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STEP 1. Measure the voltage at the electric parking brake ECU
connector.
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(1)Disconnect the electric parking brake ECU connector and measure at the wiring harness
side.
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(2)Turn the ignition switch to the ON position.
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(3)Measure the voltage between the IG1 terminal and body earth.
OK: Battery voltage
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Q.
Is the check result normal?
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 Go to Step 2.
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 The IG1 signal circuit may be open or short to earth. Repair the wiring harness
wires or connectors between the electric parking brake ECU connector and the ETACS-ECU.
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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)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)Operate the electric parking brake switch to apply 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. C2254 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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