Parking And Back-Up Sensor Control Unit Input Test (2018-19)

NOTE:

Before testing, check for DTCs. If any DTCs are indicated, troubleshoot those DTCs first.
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 (2018-19) .
Before testing, make sure the gauge control module self-diagnostic function - Refer to: Gauges Self-Diagnostic Function (Without SH-AWD), or Gauges Self-Diagnostic Function (With SH-AWD) to make sure the beeper in the gauge control module work properly, and communication line checks are OK.
Before testing, make sure the No. B5 (7.5 A) fuse in the under-dash fuse/relay box is OK.

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

2. Disconnect the parking and back-up sensor control unit 16P connector.

PARKING and BACK-UP SENSOR CONTROL UNIT 16P CONNECTOR (female terminals)

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

3. Inspect the connector 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. With the connector still disconnected, 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, go to step 5.

Cavity	Wire	Test condition	Test: Desired result	Possible cause if desired result is not obtained
5	PUR	Vehicle ON mode	Connect to ground with a jumper wire: The parking and back-up sensor switch indicator should come on.	Faulty LED Faulty parking and back-up sensor switch An open or high resistance in the wire
7	WHT	Disconnect the left front corner sensor 6P connector	Check for continuity between terminal No. 7 and left front corner sensor 6P connector terminal No. 6: There should be continuity.	An open or high resistance in the wire
7	WHT	Disconnect the left front corner sensor 6P connector	Check for continuity between the terminal No. 7 and body ground: There should be no continuity.	A short to ground in the wire
13	PNK	Disconnect the left front corner sensor 6P connector	Check for continuity between terminal No. 13 and left front corner sensor 6P connector terminal No. 2: There should be continuity.	An open or high resistance in the wire
13	PNK	Disconnect the left front corner sensor 6P connector	Check for continuity between the terminal No. 13 and body ground: There should be no continuity.	A short to ground in the wire
6	TAN	Disconnect the left front corner sensor 6P connector	Check for continuity between terminal No. 6 and left front corner sensor 6P connector terminal No. 4: There should be continuity.	An open or high resistance in the wire
6	TAN	Disconnect the left front corner sensor 6P connector	Check for continuity between the terminal No. 6 and body ground: There should be no continuity.	A short to ground in the wire
16	GRY	Disconnect the left rear corner sensor 6P connector	Check for continuity between terminal No. 16 and left rear corner sensor 6P connector terminal No. 6: There should be continuity.	An open or high resistance in the wire
16	GRY	Disconnect the left rear corner sensor 6P connector	Check for continuity between the terminal No. 16 and body ground: There should be no continuity.	A short to ground in the wire
12	BLU	Disconnect the left rear corner sensor 6P connector	Check for continuity between terminal No. 12 and left rear corner sensor 6P connector terminal No. 2: There should be continuity.	An open or high resistance in the wire
12	BLU	Disconnect the left rear corner sensor 6P connector	Check for continuity between the terminal No. 12 and body ground: There should be no continuity.	A short to ground in the wire
14	TAN	Disconnect the left rear corner sensor 6P connector	Check for continuity between terminal No. 14 and left rear corner sensor 6P connector terminal No. 4: There should be continuity.	An open or high resistance in the wire
14	TAN	Disconnect the left rear corner sensor 6P connector	Check for continuity between the terminal No. 14 and body ground: There should be no continuity.	A short to ground in the wire

5. Reconnect the connector, 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 parking and back-up sensor control unit - Refer to: Parking and Back-Up Sensor Control Unit Removal and Installation (Without SH-AWD), or Parking and Back-Up Sensor Control Unit Removal and Installation (With SH-AWD) .

Cavity	Wire	Test condition	Test: Desired result	Possible cause if desired result is not obtained
8	BRN	Vehicle ON mode	Measure the voltage to ground: There should be battery voltage.	An open or high resistance in the wire
4	BLK	In all power modes	Measure the voltage to ground: There should be less than 0.2 V.	Poor ground (G202) An open or high resistance in the ground wire
15	YEL	Vehicle ON mode, and parking and back-up sensor switch ON	Measure the voltage to ground: There should be less than 0.2 V.	Faulty parking and back-up sensor switch An open or high resistance in the ground wire