Turn Signal/Hazard Warning Lights (MICU) Input Test (2017 2018 2019 2020)

NOTE:

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 (2017 2018 2019 2020) .
Before testing, make sure the No. B9 (10 A) and No. B2-6 (30 A) fuses in the main under-hood fuse box is OK.
Before testing, make sure the No. C16 (10 A) fuse in the under-hood fuse/relay box is OK.
Before testing, make sure the No. D11 (7.5 A) fuse in the driver's under-dash fuse/relay box is OK.

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

2. Disconnect driver's under-dash fuse/relay box connectors.

Driver's under-dash fuse/relay box connector E (44P) (female terminals): Driver's under-dash fuse/relay box connector F (32P) (female terminals): Driver's under-dash fuse/relay box connector G (16P) (female terminals): Driver's under-dash fuse/relay box connector H (13P) (female terminals): Driver's under-dash fuse/relay box connector K (8P) (female terminals): Driver's under-dash fuse/relay box connector M (8P) (female terminals): Driver's under-dash fuse/relay box connector P (24P) (female terminals): Driver's under-dash fuse/relay box connector Q (20P) (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. 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 5.

Cavity	Wire	Test condition	Test: Desired result	Possible cause if desired results not obtained
F8	BLU	Connect terminals F8 and F11 with a jumper wire	Check the turn signal lights operation: The left front turn signal light should come on.	Blown bulb Poor ground (G201) or an open in the ground wire An open or high resistance in the wire
F12	WHT	Connect terminals F12 and F11 with a jumper wire	Check the turn signal lights operation: The right front turn signal light should come on.	Blown bulb Poor ground (G202) or an open in the ground wire An open or high resistance in the wire
E10	BLU	Connect terminals E10 and F11 with a jumper wire	Check the turn signal lights operation: The left rear turn signal light should come on.	Blown bulb Poor ground (G606) or an open in the ground wire An open or high resistance in the wire
E11	GRN/WHT	Connect terminals E11 and F11 with a jumper wire	Check the turn signal lights operation: The right rear turn signal light should come on.	Blown bulb Poor ground (G605) or an open in the ground wire An open or high resistance in the wire
M2	BLU	Connect terminals M2 and F11 with a jumper wire	Check the turn signal lights operation: The left side turn signal light and left turn signal indicator should come on.	Faulty LED Faulty gauge control module Poor ground (G501) or an open in the ground wire An open or high resistance in the wire
M5	WHT	Connect terminals M5 and F11 with a jumper wire	Check the turn signal lights operation: The right side turn signal light and right turn signal indicator should come on.	Faulty LED Faulty gauge control module Poor ground (G507) or an open in the ground wire An open or high resistance in the wire

5. Reconnect the connectors to the driver's under-dash fuse/relay box, 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, the MICU must be faulty; replace the driver's under-dash fuse/relay box - Refer to: Driver's Under-Dash Fuse/Relay Box Removal and Installation .

Cavity	Wire	Test condition	Test: Desired result	Possible cause if desired results not obtained
G16	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 An open or high resistance in the wire

Cavity	Wire	Test condition	Test: Desired result	Possible cause if desired results not obtained
F11	WHT	Under all conditions	Measure the voltage to ground: There should be battery voltage.	Blown No. B2-6 (30 A) fuse in the main under-hood fuse box Blown No. B9 (10 A) fuse in the main under-hood fuse box An open or high resistance in the wire
G6	BLK	In all power modes	Measure the voltage to ground: There should be less than 0.2 V.	Poor ground (G506) An open or high resistance in the ground wire
H1	BLK	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
P2	BRN	In all power modes	Measure the voltage to ground: There should be less than 0.2 V.	Poor ground (G501) An open or high resistance in the ground wire
K5	WHT	Under all conditions	Measure the voltage to ground: There should be battery voltage.	Blown No. B2-6 (30 A) fuse in the main under-hood fuse box Blown No. B9 (10 A) fuse in the main under-hood fuse box Faulty driver's under-dash fuse/relay box An open or high resistance in the ground wire
Q11	GRN	Hazard warning switch pressed	Measure the voltage to ground: There should be battery voltage.	Faulty hazard warning switch An open or high resistance in the ground wire
P23P13	LT GRNBLK	Turn signal switch in left position	Measure the voltage between terminals P23 and P13:There should be less than 0.2 V.	Faulty turn signal switch An open or high resistance in the wire
P23P13	LT GRNBLK	Turn signal switch in right or neutral position	Measure the voltage between terminals P23 and P13:There should be about 5 V.	Faulty turn signal switch A short to ground in the wire
P22P13	REDBLK	Turn signal switch in right position	Measure the voltage between terminals P22 and P13:There should be less than 0.2 V.	Faulty turn signal switch An open or high resistance in the ground wire
P22P13	REDBLK	Turn signal switch in left or neutral position	Measure the voltage between terminals P22 and P13:There should be about 5 V.	Faulty turn signal switch A short to ground in the wire