DTC U3003-68

DTC U3003-68  : Electric Parking Brake Control Unit Internal Circuit Malfunction (Power Self-Holding Circuit)

NOTE: Before you troubleshoot, review the general troubleshooting information .

DTC (Electric parking brake)

1. Problem verification

   - 1. Turn the vehicle to the ON mode.

   - 2. Clear the DTC with the HDS.

   - 3. Turn the vehicle to the OFF (LOCK) mode, then to the ON mode.

   - 4. Check for DTCs with the HDS.

   DTC Description	DTC
   U3003-68 Electric Parking Brake Control Unit Internal Circuit Malfunction (Power Self-Holding Circuit)

   Is DTC U3003-68 indicated?

   YES 

   The failure is duplicated. Go to step 2.

   NO 

   Intermittent failure, the system is OK at this time. Refer to intermittent failures troubleshooting .

2. Fuse check

   - 1. Turn the vehicle to the OFF (LOCK) mode.

   - 2. Check the following fuses.

   Fuse	No. F15 (30 A)
   	No. F16 (30 A)
   Location	Rear fuse/relay box

   Are the fuses OK?

   YES 

   The fuse is OK. Reinstall the fuse, then go to step 3.

   NO 

   Replace the fuse. If the fuse blows again, repair a short to ground in the No. F15 (30 A), No. F16 (30 A) fuse circuit.

3. Open wire check (+B L EPB MTR, +B R EPB MTR lines)

   - 1. Disconnect the following connector.

   Electric parking brake control unit 30P connector

   - 2. Measure the voltage between test points 1 and 2.

   Test condition	Vehicle OFF (LOCK) mode
   	Electric parking brake control unit 30P connector: disconnected
   Test circuit 1
   Test point 1	Electric parking brake control unit 30P connector No. 1
   Test point 2	Body ground

   Test circuit 2
   Test point 1	Electric parking brake control unit 30P connector No. 3
   Test point 2	Body ground

   Is there battery voltage?

   YES 

   The +B L EPB MTR and +B R EPB MTR wires are OK. Go to step 4.

   NO 

   Repair an open in the wire between the electric parking brake control unit and the F15 (30 A) or No. F16 (30 A) fuse in the rear fuse/relay box.

4. Open wire check (PGND lines)

   - 1. Check for continuity between test points 1 and 2.

   Test condition	Vehicle OFF (LOCK) mode
   	Electric parking brake control unit 30P connector: disconnected
   Test circuit 1
   Test point 1	Electric parking brake control unit 30P connector No. 5
   Test point 2	Body ground

   Test circuit 2
   Test point 1	Electric parking brake control unit 30P connector No. 7
   Test point 2	Body ground

   Is there continuity?

   YES 

   The PGND wires are OK. Check for any authorized service information related to the DTCs or symptoms you are troubleshooting or substitute a known-good electric parking brake control unit , then recheck. If the symptom/indication goes away with a known-good electric parking brake control unit, replace the original electric parking brake control unit .

   NO 

   Repair an open in the wire between the electric parking brake control unit and body ground (G603, G606).