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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
  • 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. 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 ground.
OK: The voltage should measure approximately 12 volts (battery positive voltage).
Is the check result normal?
Go to Step 2.
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 2. Check whether the DTC is set again.
(1)
cautionTo prevent damage to scan tool (M.U.T.-III), always turn the ignition switch to the "LOCK" (OFF) position before connecting or disconnecting scan tool (M.U.T.-III).
Connect scan tool (M.U.T.-III). Refer to "How to connect the Scan Tool (M.U.T.-III) ."
(2) Erase the DTC.
(3) Turn the ignition switch to the "LOCK" (OFF) position.
(4) Check if the DTC is set.
Is DTC No. C2304 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 ).