DTC C1120-14

DTC C1120-14  : Electric Parking Brake Switch Circuit Malfunction

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 the parameter (s) below with the HDS.

   Signal	Current conditions
   	Values	Unit
   ELECTRIC PARKING BRAKE SWITCH SIGNAL STATUS

   Is there INVALID 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. Electric parking brake switch check  . Refer to: Electric Parking Brake Switch Removal, Installation, and Test

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

   - 2. Check the electric parking brake switch.

   Is the electric parking brake switch OK?

   YES 

   Go to step 3.

   NO 

   Replace the electric parking brake/automatic brake hold switch .

3. Shorted wire check (EPB SW lines)

   - 1. Disconnect the following connectors.

   Electric parking brake control unit 30P connector

   Electric parking brake/automatic brake hold switch 12P connector

   - 2. Check for continuity between the following test points and body ground individually.

   Test condition	Vehicle OFF (LOCK) mode
   	Electric parking brake control unit 30P connector: disconnected
   	Electric parking brake/automatic brake hold switch 12P connector: disconnected

   Connector	Test circuit	Test point 1	Test point 2
   Electric parking brake control unit 30P connector	EPB SW1	No. 11	Body ground
   	EPB SW2	No. 10
   	EPB SW3	No. 28
   	EPB SW4	No. 27

   Is there continuity?

   YES 

   Repair a short to body ground in the wire between the electric parking brake control unit and the electric parking brake/automatic brake hold switch.

   NO 

   The EPB SW wires are not shorted. Go to step 4.

4. Open wire check (EPB SW 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
   	Electric parking brake/automatic brake hold switch 12P connector: disconnected
   Test circuit 1
   Test point 1	Electric parking brake control unit 30P connector No. 11
   Test point	Electric parking brake/automatic brake hold switch 12P connector (female terminals) No. 4: (1)

   Test circuit 2
   Test point 1	Electric parking brake control unit 30P connector No. 10
   Test point 2	Electric parking brake/automatic brake hold switch 12P connector (female terminals) No. 1: (1)

   Test circuit 3
   Test point 1	Electric parking brake control unit 30P connector No. 28
   Test point 2	Electric parking brake/automatic brake hold switch 12P connector (female terminals) No. 2: (1)

   Test circuit 4
   Test point 1	Electric parking brake control unit 30P connector No. 27

   Test point 2

   Electric parking brake/automatic brake hold switch 12P connector (female terminals) No. 11: (1)

   Courtesy of HONDA, U.S.A., INC.

   Is there continuity?

   YES 

   The EPB SW 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 the electric parking brake/automatic brake hold switch.