Keyless Access System (Keyless Access Control Unit, Electric Steering Lock, and TPMS Control Unit) (2016 2017 2018 2019 2020 2021 2022)

Keyless Access/TPMS Control Unit

NOTE:

Before testing, troubleshoot the multiplex integrated control unit first, using B-CAN System Diagnosis Test Mode A .
Before testing, check for DTCs. If any DTCs are indicated, troubleshoot those DTCs first.
Before testing, make sure the No. A1-6 (120 A), No. A2-3 (60 A), No. A2-7 (30 A), No. A2-9 (30 A), and the No. A29 (10 A) fuses in the under-hood fuse box are OK.
Before testing, make sure the B4 (15 A) and the No. B31 (10 A) fuses in the under-dash fuse/relay box are OK.

1. Press the engine start/stop button to select the OFF mode.

2. Disconnect the keyless access/TPMS control unit connectors

.NOTE: All connector views are shown from the wire side of the female terminals.

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

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 look OK, go to step 4.

With the connectors 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, then go to step 5.

Cavity	Wire	Test condition	Test: Desired result	Possible cause if desired result is not obtained
C4	LT BLU	Under all conditions	Check for continuity between terminal C4 and data link connector (DLC) terminal No. 7:There should be continuity.	An open or high resistance in the K-LINE wire
C4	LT BLU	Under all conditions	Check for continuity between terminal C4 and body ground:There should be no continuity.	A short to ground in the K-LINE wire
C6	YEL	Under all conditions	Check for continuity between terminal C6 and data link connector (DLC) terminal No. 15:There should be continuity.	An open or high resistance in the L-LINE wire
C6	YEL	Under all conditions	Check for continuity between terminal C6 and body ground:There should be no continuity.	A short to ground in the L-LINE wire
B10	BLU	Press the engine start/stop switch button	Measure the voltage to ground:There should be battery voltage.	Blown No. B31 (10 A) fuse in the under-dash fuse/relay box Faulty under-dash fuse/relay box Faulty engine start/stop switch An open or high resistance in the wire
B11	GRN	Press the engine start/stop switch button	Check for continuity to ground:There should be continuity.	Faulty engine start/stop switch An open or high resistance in the wire
C5	GRY	Jump the SCS line with the HDS, disconnect PCM connector A (51P)	Check for continuity between terminal C5 and PCM connector A (51P) terminal No. 6:There should be continuity.	An open in the S-NET wire PCM
		Disconnect under-dash fuse/relay box connector P (20P)	Check for continuity between terminal C5 and under-dash fuse/relay box connector P (20P) terminal No. 4:There should be continuity.	An open in the S-NET wire Faulty under-dash fuse/relay box
		Disconnect under-dash fuse/relay box connector P (20P)	Check for continuity between terminal C5 and body ground:There should be no continuity.	A short to ground in the S-NET wire

Reconnect the connectors, and do the following input tests:

If any test indicates a problem, find and correct the cause, then recheck the system.
USA and Canada models: If all the input tests prove OK, then go to step 10.
Mexico models: If all the input tests prove OK, then go to step 6.

Cavity	Wire	Test condition	Test: Desired result	Possible cause if desired result is not obtained
A1	YEL	Under all conditions	Measure the voltage to ground:There should be battery voltage.	Blown No. B31 (10 A) fuse in the driver's under-dash fuse/relay box Faulty under-dash fuse/relay box An open or high resistance in the wire

*: Mexico models

Cavity	Wire	Test condition	Test: Desired result	Possible cause if desired result is not obtained
B18	GRN	Under all conditions	Measure the voltage to ground:There should be battery voltage.	Blown No. A29 (10 A) fuse in the under-hood fuse/relay box Faulty under-hood fuse/relay box An open or high resistance in the wire
A17	BRN	In all power modes	Measure the voltage to ground:There should be less than 0.2 V.	Poor ground (G503) An open or high resistance in the ground wire
B36	BRN	In all power modes	Measure the voltage to ground:There should be less than 0.2 V.	Poor ground (G503) An open or high resistance in the ground wire
B30	RED	Power mode ON	Measure the voltage to ground:There should be battery voltage.	Blown No. A2-7 (30 A) fuse in the main under-hood/relay fuse box Faulty under-dash subrelay box An open or high resistance in the wire
B34	YEL	Power mode ON	Measure the voltage to ground:There should be battery voltage.	Blown No. B4 (15 A) fuse in the under-dash fuse/relay box Faulty under-dash fuse/relay box Faulty under-dash subrelay box An open or high resistance in the wire
B15	PUR	Power mode ON	Measure the voltage to ground:There should be battery voltage.	Blown No. A2-9 (30 A) fuse in the under-hood fuse/relay box Faulty accessory relay Faulty under-dash subrelay box An open or high resistance in the wire
B29	YEL	Power mode ON	Measure the voltage to ground:There should be battery voltage.	Blown No. A2-9 (30 A) fuse in the under-hood fuse/relay box Faulty under-dash subrelay box An open or high resistance in the wire
B27	BRN	Power mode ON	Measure the voltage to ground:There should be battery voltage.	Blown No. A2-7 (30 A) fuse in the under-hood fuse/relay box Faulty under-dash subrelay box An open or high resistance in the wire
C14	WHT	Driver's door outer handle lock button pushed	Measure the voltage to ground:There should be less than 0.2 V.	Faulty driver's door outer handle Poor ground (G501) or an open in the ground wire An open or high resistance in the wire
C14	WHT	Driver's door outer handle lock button released	Measure the voltage to ground:There should be about 5 V.	Faulty driver's door outer handle A short to ground in the wire

*: Mexico models

Cavity	Wire	Test condition	Test: Desired result	Possible cause if desired result is not obtained
C13	RED	Front passenger's door outer handle lock button pushed	Measure the voltage to ground:There should be less than 0.2 V.	Faulty front passenger's door outer handle Poor ground (G506) or an open in the ground wire An open or high resistance in the wire
C13	RED	Front passenger's door outer handle lock button released	Measure the voltage to ground:There should be about 5 V.	Faulty front passenger's door outer handle A short to ground in the wire
B1	LT GRN	Parking brake pulled (apply)	Measure the voltage to ground:There should be less than 0.2 V.	Faulty parking brake switch Faulty parking brake switch ground An open or high resistance in the wire
B1	LT GRN	Parking brake released	Measure the voltage to ground:There should be about 5 V.	Faulty parking brake switch A short to ground in the wire
C16	PUR	Trunk lid outer handle button pushed	Measure the voltage to ground:There should be less than 0.2 V.	Faulty trunk lid outer handle switch Poor ground (G701) or an open in the ground wire An open or high resistance in the wire
C16	PUR	Trunk lid outer handle button released	Measure the voltage to ground:There should be about 5 V.	Faulty trunk lid outer handle switch A short to ground in the wire
C10	PNK	Shift lever in P position/mode	Measure the voltage to ground:There should be less than 0.2 V.	Faulty transmission range switch Poor ground (G101) or an open in the ground wire An open or high resistance in the wire
C10	PNK	Shift lever in any position/mode other than P	Measure the voltage to ground:There should be about 5 V.	Faulty transmission range switch A short to ground in the wire
C9	LT BLU	Shift lever in P position/mode	Measure the voltage to ground:There should be about 5 V.	Faulty park pin switch A short to ground in the wire
C9	LT BLU	Shift lever in any position/mode other than P	Measure the voltage to ground:There should be less than 0.2 V.	Faulty park pin switch Poor ground (G602) or an open in the ground wire An open or high resistance in the wire
B19	LT GRN	Brake pedal pressed	Measure the voltage to ground:There should be battery voltage.	Blown No. A18 (10 A) fuse in the under-hood fuse/relay box Faulty under-hood fuse/relay box Faulty brake pedal position switch An open or high resistance in the wire A short to ground in the wire
B3 *	BRN	Disconnect the electric steering lock 12P connector	Check for continuity between terminal B3 and electric steering lock 12P connector terminal No. 8:There should be continuity.	An open or high resistance in the wire

*: Mexico models

Cavity	Wire	Test condition	Test: Desired result	Possible cause if desired result is not obtained
B13	GRN	Disconnect the keyless buzzer 3P connector	Check for continuity between terminal B13 and keyless buzzer 3P connector terminal No. 2:There should be continuity.	An open or high resistance in the wire

*: Mexico models

Electric Steering Lock

NOTE:

SRS components are located in this area. Review the SRS component locations , and precautions and procedures before doing repairs or servicing.
Before testing, check for DTCs. If any DTCs are indicated, troubleshoot those DTCs first.

6. Press the engine start/stop button to select the OFF mode.

7. Disconnect the electric steering lock 12P connector

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

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 look OK, then go to step 9.

With the connectors 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 10.

Cavity	Wire	Test condition	Test: Desired result	Possible cause if desired result is not obtained
3	YEL	Under all conditions	Measure the voltage to ground:There should be battery voltage.	Blown No. B31 (10 A) fuse in the under-dash fuse/relay box Faulty under-dash fuse/relay box An open or high resistance in the wire
12	YEL	Power mode ON	Measure the voltage to ground:There should be battery voltage.	Blown No. B4 (15 A) fuse in the under-dash fuse/relay box Faulty under-dash fuse/relay box Faulty under-dash subrelay box An open or high resistance in the wire
7	GRY	In all power modes	Measure the voltage to ground:There should be less than 0.2 V.	Poor ground (G502) An open or high resistance in the ground wire

Cavity	Wire	Test condition	Test: Desired result	Possible cause if desired result is not obtained
8	BRN	Electric steering lock (UNLOCK)	Measure the voltage to ground:There should be less than 0.2 V.	An open or high resistance in the wire
8	BRN	Electric steering lock (LOCK)	Measure the voltage to ground:There should be about 5 V.	A short to ground in the wire
5	TAN	Power mode ON	Measure the voltage to ground:There should be battery voltage.	Faulty keyless access/TPMS control unit An open or high resistance in the wire A short to ground in the wire

10. If multiple failures are found on more than one control unit, replace the keyless access/TPMS control unit . If input failures are related to a particular control unit, replace the control unit.