Honda HR-V Owners & Service Manuals

Honda HR-V: DTC B1127 Driver's Door Key Cylinder Switch Input Circuit Malfunction (Simultaneous Input of Lock and Unlock Signal)

Honda HR-V (2015-2021) Service Manual / Accessories & Equipment / Multiplex Integrated Control Unit (Micu) - Diagnostics / DTC B1127 Driver's Door Key Cylinder Switch Input Circuit Malfunction (Simultaneous Input of Lock and Unlock Signal)

Multiplex Integrated Control Unit (Micu) - Diagnostics

DTC (MICU)

NOTE : If you are troubleshooting multiple DTCs, be sure to follow the instructions in B-CAN System Diagnosis Test Mode A - Refer to: Body Electrical Troubleshooting - B-CAN System Diagnosis Test Mode A - Initial Communication and DTC Checks.

1. Problem verification (driver's door key cylinder switch in the neutral position):

  1. With the driver's door key cylinder in the neutral position, check the parameter(s) below with the HDS.

Multiplex Integrated Control Unit (Micu) - Diagnostics

Is either information indicator ON?

YES

Go to step 4.

NO

Go to step 2.

2. Problem verification (driver's door key cylinder switch in the lock position):

  1. With the driver's door key cylinder in the lock position, check the parameter(s) below with the HDS.

Multiplex Integrated Control Unit (Micu) - Diagnostics

Are both information indicators ON?

YES

Go to step 3.

NO

Intermittent failure, the system is OK at this time.

3. Shorted wire check (DR KEY CYL UNLOCK to DR KEY CYL LOCK line):

  1. Turn the vehicle to the OFF (LOCK) mode.
  2. Disconnect the following connector.

Driver's door latch 10P connector

  1. Connect terminals A and B with a jumper wire.

Multiplex Integrated Control Unit (Micu) - Diagnostics

  1. Check the parameter(s) below with the HDS.

Multiplex Integrated Control Unit (Micu) - Diagnostics

Are both information indicators ON?

YES

Repair a short between the wires.

NO

The DR KEY CYL UNLOCK to DR KEY CYL LOCK wire is OK. Faulty driver's door key cylinder switch; replace the driver's door latch.

4. Determine possible failure area (driver's door latch, others):

  1. Turn the vehicle to the OFF (LOCK) mode.
  2. Disconnect the following connector.

Driver's door latch 10P connector

  1. Check the parameter(s) below with the HDS.

Multiplex Integrated Control Unit (Micu) - Diagnostics

Is either information indicator ON?

YES

Go to step 5.

NO

Faulty driver's door key cylinder switch; replace the driver's door latch.

5. Shorted wire check (DR KEY CYL UNLOCK, DR KEY CYL LOCK lines):

  1. Turn the vehicle to the OFF (LOCK) mode.
  2. Disconnect the following connector.

Under-dash fuse/relay box connector D (24P)

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

Multiplex Integrated Control Unit (Micu) - Diagnostics

Is there continuity?

YES

Repair a short to ground in the wire(s).

NO

The DR KEY CYL UNLOCK and DR KEY CYL LOCK wires are OK. Faulty MICU; replace the under-dash fuse/relay box.

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