Power Tailgate Control Unit Input Test (2017 2018 2019 2020)

NOTE:

Before testing, make sure the No. C16 (10 A) fuse in the under-hood fuse/relay box are OK.
Before testing, make sure the No. D10 (7.5 A) fuse in the driver's under-dash fuse/relay box is OK.
Before testing, make sure the No. F1 (20 A), No. F13 (7.5 A) and No. F18 (40 A) fuses in the rear fuse/relay box is OK.
Before testing, check for DTCs. If any DTCs are indicated, troubleshoot those DTCs first.

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

2. Disconnect the power tailgate control unit connectors.

Power tailgate control unit connector A (5P) (female terminals): Power tailgate control unit connector B (20P) (female terminals): Power tailgate control unit connector C (14P) (female terminals):

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

3. Inspect the connectors and socket terminals to be sure they are all making good contact:

If the terminals are bent, loose, or corroded, repair them as necessary, and recheck the system.
If the terminals are OK, go to step 4.

4. Reconnect the connectors, and do the following input tests:

If any test indicates a problem, find and correct the cause, then recheck the system.
If all the input tests prove OK, replace the power tailgate control unit .

Cavity	Wire	Test condition	Test: Desired result	Possible cause if desired results not obtained
A1	BRN	Under all conditions	Measure the voltage to ground: There should be battery voltage.	Blown No. F18 (40 A) fuse in the rear fuse/relay box An open or high resistance in the wire
B19	PNK	Under all conditions	Measure the voltage to ground: There should be battery voltage.	Blown No. F1 (20 A) fuse in the rear fuse/relay box An open or high resistance in the wire
B20	GRN	Under all conditions	Measure the voltage to ground: There should be battery voltage.	Blown No. C16 (10 A) fuse in the under-hood fuse/relay box Faulty driver's under-dash fuse/relay box An open or high resistance in the wire
C8	LT GRN	Power mode ON	Measure the voltage to ground: There should be battery voltage.	Blown No. F13 (7.5 A) fuse in the rear fuse/relay box An open or high resistance in the wire
A2	BLK	In all power modes	Measure the voltage to ground: There should be less than 0.2 V.	Poor ground (G603) An open or high resistance in the ground wire
A4	BLK	In all power modes	Measure the voltage to ground: There should be less than 0.2 V.	Poor ground (G603) An open or high resistance in the ground wire
B3	LT GRN	Shift position/mode in P	Check for continuity to ground: There should be continuity.	Faulty TCM Faulty SBW shifter control module An open or high resistance in the wire
B3	LT GRN	Shift position/mode in any position other than P	Check for continuity to ground: There should be no continuity.	Faulty TCM Faulty SBW shifter control module A short to ground in the wire