DTC C1270-15

DTC C1270-15  : Automatic Brake Hold Switch Signal Circuit Open

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

DTC (Electric servo 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	Freeze Frame
   C1270-15 Automatic Brake Hold Switch Signal Circuit Open

   Is DTC C1270-15 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 . If the freeze data/on-board snapshot of this DTC is recorded, try to reproduce the failure under the same conditions with the freeze data/on-board snapshot.

2. Automatic brake hold switch check

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

   -2. Check the automatic brake hold switch .

   Is the automatic brake hold switch OK?

   YES 

   Go to step 3.

   NO 

   Replace the electric parking brake/automatic brake hold switch .

3. Open wire check (BRAKE_HOLD line) 1

   -1. Disconnect the following connector.

   Electric parking brake/automatic brake hold switch 12P connector

   -2. Turn the vehicle to the ON mode.

   -3. Measure the voltage between test points 1 and 2.

   Test condition	Vehicle ON mode
   	Electric parking brake/automatic brake hold switch 12P connector: disconnected
   Test point 1	Electric parking brake/automatic brake hold switch 12P connector (female terminals) No. 7:
   Test point 2	Body ground

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

   Is there about 5 V?

   YES 

   The BRAKE_HOLD wire is OK. Go to step 4.

   NO 

   Go to step 5.

   NO 

   Go to step 6.

4. Open wire check (GND line)

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

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

   Test condition	Vehicle OFF (LOCK) mode
   	Electric parking brake/automatic brake hold switch 12P connector: disconnected
   Test point 1	Electric parking brake/automatic brake hold switch 12P connector No. 8 (female terminals):
   Test point 2	Body ground

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

   Is there 1.0 Ω or less?

   YES 

   The GND wire is OK. Check for any authorized service information related to the DTCs or symptoms you are troubleshooting or substitute a known-good gauge control module , then recheck. If the symptom/indication goes away with a known-good gauge control module, replace the original gauge control module .

   NO 

   Repair an open in the wire between the electric parking brake/automatic brake hold switch and body ground (G402).

5. Shorted wire check (BRAKE_HOLD line to power)

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

   -2. Disconnect the following connector.

   Gauge control module connector A (32P)

   -3. Turn the vehicle to the ON mode.

   -4. Measure the voltage between test points 1 and 2.

   Test condition	Vehicle ON mode
   	Electric parking brake/automatic brake hold switch 12P connector: disconnected
   	Gauge control module connector A (32P): disconnected
   Test point 1	Electric parking brake/automatic brake hold switch 12P connector (female terminals) No. 7:
   Test point 2	Body ground

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

   Is there 0.1 V or more?

   YES 

   Repair a short to power in the wire between the automatic brake hold switch and the gauge control module.

   NO 

   The BRAKE_HOLD wire is OK. Check for any authorized service information related to the DTCs or symptoms you are troubleshooting or substitute a known-good gauge control module , then recheck. If the symptom/indication goes away with a known-good gauge control module, replace the original gauge control module .

6. Open wire check (BRAKE_HOLD line) 2

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

   -2. Disconnect the following connector.

   Gauge control module connector A (32P)

   -3. Measure the resistance between test points 1 and 2.

   Test condition	Vehicle OFF (LOCK) mode
   	Electric parking brake/automatic brake hold switch 12P connector: disconnected
   	Gauge control module connector A (32P): disconnected
   Test point 1	Electric parking brake/automatic brake hold switch 12P connector (female terminals) No. 7:
   Test point 2	Gauge control module connector A (32P) No. 12

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

   Is there 1.0 Ω or less?

   YES 

   The BRAKE_HOLD wire is OK. Check for any authorized service information related to the DTCs or symptoms you are troubleshooting or substitute a known-good gauge control module , then recheck. If the symptom/indication goes away with a known-good gauge control module, replace the original gauge control module .

   NO 

   Repair an open in the wire between the electric parking brake/automatic brake hold switch and the gauge control module.