DTC C1120-14 (2014 2015)

DTC C1120-14  : Electric Parking Brake Switch Circuit Malfunction

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 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

   -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 switch .

3. Shorted wire check (SW lines)

   -1. Disconnect the following connectors.

   Electric parking brake switch 12P connector

   Electric parking brake control unit 30P connector

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

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

   Connector	Test circuit	Terminal
   Electric parking brake control unit 30P connector	SW1	No. 11 (ORN)
   	SW2	No. 10 (BLU)
   	SW3	No. 28 (YEL)
   	SW4	No. 27 (BRN)

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

   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 switch.

   NO 

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

4. Open wire check (SW lines)

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

   Test condition	Vehicle OFF (LOCK) mode
   	Electric parking brake switch 12P connector: disconnected
   	Electric parking brake control unit 30P connector: disconnected
   Test circuit	SW1
   Test point 1	Electric parking brake switch 12P connector No. 4 (ORN)
   Test point 2	Electric parking brake control unit 30P connector No. 11 (ORN)

   Test circuit	SW2
   Test point 1	Electric parking brake switch 12P connector No. 11 (BLU)
   Test point 2	Electric parking brake control unit 30P connector No. 10 (BLU)

   Test circuit	SW3
   Test point 1	Electric parking brake switch 12P connector No. 10 (YEL)
   Test point 2	Electric parking brake control unit 30P connector No. 28 (YEL)

   Test circuit	SW4
   Test point 1	Electric parking brake switch 12P connector No. 1 (BRN)
   Test point 2	Electric parking brake control unit 30P connector No. 27 (BRN)

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

   Is there continuity?

   YES 

   The SW wires are OK. Go to step 5.

   NO 

   Repair an open in the wire between the electric parking brake control unit and the electric parking brake switch.

5. Electric parking brake control unit check (update or substitution)

   -1. Update the electric parking brake control unit if it does not have the latest software . If the unit already has the latest software, substitute a known-good electric parking brake control unit .

   -2. Turn the vehicle to the OFF (LOCK) mode, then the ON mode.

   -3. Check for DTCs with the HDS.

   DTC Description	DTC
   C1120-14 Electric Parking Brake Switch Circuit Malfunction

   Is DTC C1120-14 indicated?

   YES 

   Check for loose terminals and poor connections at the electric parking brake control unit. If the electric parking brake control unit was updated, substitute a known-good electric parking brake control unit , then retest. If the electric parking brake control unit was substituted, go to step 1.

   NO 

   If the electric parking brake control unit was updated, troubleshooting is complete. If the electric parking brake control unit was substituted, replace the original electric parking brake control unit .