Honda Pilot: Hazard Warning Switch Test

Test

1. Dashboard Center Panel - Remove

2. Hazard Warning Switch - Test

1. Check for continuity between the terminals in each switch position according to the table.

NOTE:

• When an LED is located between terminals, check if the LED illuminates by connecting power and ground to the LED.
• Note this important operating characteristic; diode bias causes a diode to fully conduct electricity in one direction (forward), while not at all in the opposite direction (reverse).

2. If the continuity is not as specified, replace the hazard warning switch (A).

3. All Removed Parts - Install

1. Install the parts in the reverse order of removal.

Headlight Leveling Control Unit Input Test

NOTE:

• Before testing, check for DTCs. If any DTCs are indicated, troubleshoot those DTCs first, and combination light switch circuit is OK.
• If you are troubleshooting multiple DTCs, be sure to follow the instructions in B-CAN System
• Diagnosis Test Mode A.
• Before testing, make sure the No. C28 (10 A) fuse in the under-dash subrelay box is OK.

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

2. Disconnect the headlight leveling control unit 12P connector.

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. 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 headlight leveling control unit.

  NOTE: After replacing the headlight leveling control unit, do the headlight initial position learning procedure.

Cavity	Wire	Test condition	Test: Desired result	Possible cause if desired result is not obtained
6	PUR	Vehicle ON mode	Measure the voltage to ground: There should be battery voltage.	Blown No. C28 (10 A) fuse in the under-dash subrelay box An open or high resistance in the wire
12	BLK	In all power modes	Measure the voltage to ground: There should be less than 0.2 V.	Poor ground (G201) An open or high resistance in the ground wire
3	PUR	Under all conditions	Check for continuity to ground: There should be continuity.	Poor ground (G201) An open or high resistance in the ground wire
4	YEL	Under all conditions	Check for continuity to ground: There should be continuity.	Poor ground (G201) An open or high resistance in the ground wire
5	GRN	Vehicle ON mode, and headlight switch ON	Measure the voltage between terminals No. 5 and No. 4: There should be about 5 V.	Faulty headlight leveling motor An open or high resistance in the wire
4	YEL
11	BRN	Vehicle ON mode, and headlight switch ON	Measure the voltage between the terminals No. 11 and No. 4: There should be about 0.5 to 4.5 V.	Faulty headlight leveling motor An open or high resistance in the wire
4	YEL
2	LT GRN	Vehicle ON mode, and headlight switch ON	Measure the voltage between terminals No. 3 and No. 10: There should be about 5 V. Measure the voltage between terminals No. 2 and No. 3: There should be about 0.5 to 4.5 V.	Faulty front suspension stroke sensor An open or high resistance in the wire
3	PUR
10	PNK
1	WHT	Vehicle ON mode, and headlight switch ON	Measure the voltage between terminals No. 3 and No. 10: There should be about 5 V. Measure the voltage between terminals No. 1 and No. 3: There should be about 0.5 to 4.5 V.	Faulty rear suspension stroke sensor An open or high resistance in the wire
3	PUR
10	PNK

Headlight Leveling Motor Input Test

NOTE: Before testing, check for DTCs. If any DTCs are indicated, troubleshoot those DTCs first, and combination light switch circuit is OK.

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

2. Disconnect the headlight leveling motor 3P connector.

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, replace the headlight leveling motor.
• Do the headlight leveling control unit input test.

Cavity	Wire	Test condition	Test: Desired result	Possible cause if desired result is not obtained
3	GRN	Vehicle ON mode	Measure the voltage to ground: There should be battery voltage.	Faulty headlight leveling control unit An open or high resistance in the wire
1	YEL	Under all conditions	Check for continuity to ground: There should be continuity.	Faulty headlight leveling control unit Poor ground (G201) or an open in the ground wire An open or high resistance in the wire
2	BRN	Vehicle ON mode	Measure the voltage to ground: There should be about 0.5 to 4.5 V.	Faulty headlight leveling control unit An open or high resistance in the wire

Heated Steering Wheel Control Unit Input Test

NOTE:

• If you are troubleshooting multiple DTCs, be sure to follow the instructions in B-CAN System Diagnosis Test Mode A.
• SRS components are located in this area. Review the SRS component locations, and precautions and procedures before doing repairs or servicing.
• Before testing, make sure the No. A27 (10 A) fuse in the under-hood fuse/relay box is OK.
• After testing, clear the SRS control unit DTCs.

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

2. Do the 12 volt battery terminal disconnection procedure.

3. Remove the heated steering wheel control unit.

4. 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 5.

5. 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 6.

Cavity	Wire	Test condition	Test: Desired result	Possible cause if desired result is not obtained
8	BLU	Disconnect the gauge control module 32P connector and the 12 volt battery sensor 2P connector	Check for continuity between terminal No. 8 and gauge control module 32P connector terminal No. 23: There should be continuity.	Faulty cable reel An open in the LIN (METER) wire
			Check for continuity to ground: There should be no continuity.	Faulty cable reel A short to ground in the LIN (METER) wire
7	GRN	Disconnect the steering heater 4P connector	Check for continuity between terminal No. 7 and steering heater 4P connector terminal No. 4: There should be continuity.	An open or high resistance in the wire

6. 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 heated steering wheel control unit.

Cavity	Wire	Test condition	Test: Desired result	Possible cause if desired result is not obtained
2	WHT	Vehicle ON mode	Measure the voltage to ground: There should be battery voltage.	Blown No. A27 (10 A) fuse in the under-hood fuse/relay box Faulty heated steering wheel relay Faulty cable reel An open or high resistance in the wire
12	BLK	In all power modes	Measure the voltage to ground: There should be less than 0.2 V.	Poor ground (G401) Poor ground (G451) Faulty cable reel An open or high resistance in the ground wire
1	RED	Disconnect the steering heater 4P connector, vehicle ON mode, and heated steering switch ON	Measure the voltage to ground: There should be battery voltage.	A short to ground in the wire Poor connection Faulty heated steering wheel control unit
6	WHT	Disconnect the steering heater 4P connector, vehicle ON mode, and heated steering switch ON	Measure the voltage to ground: There should be 5 V.	A short to ground in the wire Poor connection Faulty heated steering wheel control unit
5 - 14	RED - PNK	Vehicle ON mode, and heated steering wheel button pressed	Measure the voltage between terminals No. 5 and No. 14: There should be less than 0.2 V.	Faulty heated steering wheel switch An open or high resistance in the wire
		Vehicle ON mode, and heated steering wheel button released	Measure the voltage between terminals No. 5 and No. 14: There should be battery voltage.	Faulty heated steering wheel switch A short to ground in the wire
10	PUR	Vehicle ON mode	Connect to ground with a jumper wire: The heated steering wheel switch indicator should come on.	Faulty heated steering wheel switch An open or high resistance in the ground wire