DTC Troubleshooting: C1C21-62 (M/T) - Honda Civic FC/FK 2016-2021

1.

Problem verification:

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.

?4.	Test-drive the vehicle at 37 mph (60 km/h) or more for 3 seconds or more and stop. Shift the shift lever into reverse and test-drive the vehicle in reverse 3 times or more. NOTE: Drive the vehicle on the road, not on a lift.

?5.

Check for DTCs with the HDS.

DTC Description	DTC
C1C21-62 Reverse Information Failure (Stuck)

Is DTC C1C21-62 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.

Back-up light switch check:

Back-up light switch check

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

?2.	Check the back-up light switch check.

Is the back-up light switch OK?


	YES

Go to step 3.


	NO

Replace the back-up light switch.?

3.

Determine possible failure area (REVERSE SW/RVS SW line, REVERSE SW GND/PG or RVS SW GND line):

Determine possible failure area (REVERSE SW/RVS SW line, REVERSE SW GND/PG or RVS SW GND line)

?1.	Turn the vehicle to the ON mode.

?2.

Measure the voltage between test points 1 and 2.

Test condition	Vehicle ON mode
Test condition	Back-up light switch 4P connector: disconnected
Test point 1	Back-up light switch 4P connector (female terminals) No. 3:
Test point 2	Body ground

Is there about 5 V?


	YES (About 5 V indicated)

The REVERSE SW/RVS SW wire is OK. Go to step 4.


	NO (About 12 V indicated)

If about 12 V is indicated. Go to step 7.


	NO (About 0 V indicated)

If about 0 V is indicated. Go to step 8.

4.

Open wire check (REVERSE SW GND/PG or RVS SW GND line):

Open wire check (REVERSE SW GND/PG or RVS SW GND line)

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

?2.

Disconnect the following connector.

VSA modulator-control unit 46P connector

?3.

Check for continuity between test points 1 and 2.

Test condition	Vehicle OFF (LOCK) mode
	Back-up light switch 4P connector: disconnected
	VSA modulator-control unit 46P connector: disconnected
Test point 1	VSA modulator-control unit 46P connector No. 38
Test point 2	Back-up light switch 4P connector (female terminals) No. 1:

Is there continuity?


	YES

The REVERSE SW GND/PG or RVS SW GND wire is not open. Go to step 5.


	NO

Repair an open in the wire between the VSA modulator-control unit and the back-up light switch.?

5.

Shorted wire check (REVERSE SW GND/PG or RVS SW GND line):

Shorted wire check (REVERSE SW GND/PG or RVS SW GND line)

?1.

Check for continuity between test points 1 and 2.

Test condition	Vehicle OFF (LOCK) mode
	Back-up light switch 4P connector: disconnected
	VSA modulator-control unit 46P connector: disconnected
Test point 1	VSA modulator-control unit 46P connector No. 38
Test point 2	Body ground

Is there continuity?


	YES

Repair a short to body ground in the wire between the VSA modulator-control unit and the back-up light switch.?


	NO

The REVERSE SW GND/PG or RVS SW GND wire is not shorted. Go to step 6.

6.

Shorted wire check (REVERSE SW GND/PG or RVS SW GND line to power):

Shorted wire check (REVERSE SW GND/PG or RVS SW GND line to power)

?1.	Turn the vehicle to the ON mode.

?2.

Measure the voltage between test points 1 and 2.

Test condition	Vehicle ON mode
	Back-up light switch 4P connector: disconnected
	VSA modulator-control unit 46P connector: disconnected
Test point 1	VSA modulator-control unit 46P connector No. 38
Test point 2	Body ground

Is there 0.1 V or more?


	YES

Repair a short to power in the wire between the VSA modulator-control unit and the back-up light switch.?


	NO

Check for loose terminals and poor connections in the VSA modulator-control unit 46P connector. Check for any authorized service information related to the DTCs or symptoms you are troubleshooting. If they are OK, replace the VSA modulator-control unit.?

7.

Shorted wire check (REVERSE SW/RVS SW line to power):

Shorted wire check (REVERSE SW/RVS SW line to power)

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

?2.

Disconnect the following connector.

VSA modulator-control unit 46P connector

?3.	Turn the vehicle to the ON mode.

?4.

Measure the voltage between test points 1 and 2.

Test condition	Vehicle ON mode
	Back-up light switch 4P connector: disconnected
	VSA modulator-control unit 46P connector: disconnected
Test point 1	VSA modulator-control unit 46P connector No. 36
Test point 2	Body ground

Is there 0.1 V or more?


	YES

Repair a short to power in the wire between the VSA modulator-control unit and the back-up light switch.?


	NO

Check for loose terminals and poor connections in the VSA modulator-control unit 46P connector. Check for any authorized service information related to the DTCs or symptoms you are troubleshooting. If they are OK, replace the VSA modulator-control unit.?

8.

Open wire check (REVERSE SW/RVS SW line):

Open wire check (REVERSE SW/RVS SW line)

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

?2.

Disconnect the following connector.

VSA modulator-control unit 46P connector

?3.

Check for continuity between test points 1 and 2.

Test condition	Vehicle OFF (LOCK) mode
	Back-up light switch 4P connector: disconnected
	VSA modulator-control unit 46P connector: disconnected
Test point 1	VSA modulator-control unit 46P connector No. 36
Test point 2	Back-up light switch 4P connector (female terminals) No. 3:

Is there continuity?


	YES

The REVERSE SW/RVS SW wire is not open. Go to step 9.


	NO

Repair an open in the wire between the VSA modulator-control unit and the back-up light switch.?

9.

Shorted wire check (REVERSE SW/RVS SW line):

Shorted wire check (REVERSE SW/RVS SW line)

?1.

Check for continuity between test points 1 and 2.

Test condition	Vehicle OFF (LOCK) mode
	Back-up light switch 4P connector: disconnected
	VSA modulator-control unit 46P connector: disconnected
Test point 1	VSA modulator-control unit 46P connector No. 36
Test point 2	Body ground

Is there continuity?


	YES

Repair a short to body ground in the wire between the VSA modulator-control unit and the back-up light switch.?


	NO

Check for loose terminals and poor connections in the VSA modulator-control unit 46P connector. Check for any authorized service information related to the DTCs or symptoms you are troubleshooting. If they are OK, replace the VSA modulator-control unit.?