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DTC C2304: Left +B voltage malfunction
 
 
 
 
DTC SET CONDITIONS
If the power supply to the electric parking brake actuator (LH) fails (low voltage), the DTC will be set.
 
 
TROUBLESHOOTING HINTS
  • Malfunction of the battery
  • Malfunction of the generator
  • Damaged wiring harness or connector
    • Open or short to ground in the wires between the battery and the electric parking brake ECU, or high resistance in a connector
    • Blown fuse
  • Malfunction of the electric parking brake ECU
 
 
DIAGNOSIS
Required Special Tools:
  • MB992006: Extra Fine Probe
STEP 1. Battery check
Refer to GROUP 54A - Battery Test .
Is the battery in good condition?
Go to Step 2.
Charge or replace the battery.
 
STEP 2. Charging system check
Refer to GROUP 16 - Charging System .
Is the charging system in good condition?
Go to Step 3.
Repair or replace the charging system component(s).
 
STEP 3. Measure the voltage at the electric parking brake ECU connector.
(1) Disconnect the electric parking brake ECU connector and measure at the wiring harness side.
(2) Measure the voltage between the +B2 terminal and body ground.
OK: Battery voltage
Is the check result normal?
Go to Step 4.
The power supply circuit may be open or short to ground. Repair the wiring harness wires or connectors between the electric parking brake ECU connector and the battery.
 
STEP 4. Using scan tool (M.U.T.-IIISE), check whether the DTC is set again.
Check again if the DTC is set.
(1)
cautionTo prevent damage to scan tool (M.U.T.-IIISE), always turn the ignition switch to the "LOCK" (OFF) position 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 the ignition switch to the LOCK (OFF) position.
(4) Turn the ignition switch to the ON position.
(5) Check the DTC.
Is the DTC C2304 set?
Replace the electric parking brake ECU (Refer to ).
The trouble can be an intermittent malfunction (Refer to GROUP 00 - How to Cope with Intermittent Malfunction ).