MICU Input Test

WARNING: This page is about a different car, the 2011 Honda Insight and 2010 Honda Insight. However, it is still accessible from the selected car via links, so may be relevant.

NOTE:

Before doing the input tests, check the No. 5 (10 A), No. 16 (10 A), No. 21 (15 A), and No. 56 (30 A) fuse in the under-dash fuse/relay box.
If the rear window wiper malfunctions, and no DTCs are detected, check the rear window wiper motor and for an open in the ground circuit of the rear window wiper, (see step 1 ).

Turn the ignition switch to LOCK (0).
Remove the fuse access panel (see FUSE ACCESS PANEL REMOVAL/INSTALLATION ), and remove the driver's dashboard lower cover (see FUSE ACCESS PANEL REMOVAL/INSTALLATION ).
Disconnect under-dash fuse/relay box connectors A, B, C, K, M, N, Q, and W.
NOTE: All connector views are shown from wire side of female terminals.

Fig 1: Identifying Under-Dash Fuse/Relay Box Connectors A, B, C, K, M, N, Q, And W
Courtesy of AMERICAN HONDA MOTOR CO., 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, go to step 5.

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 6.

WIRE SPECIFICATIONS

Cavity

Wire

Test condition

Test: Desired result

Possible cause if desired result is not obtained

YEL

Ignition switch ON (II)

Measure the voltage to ground: There should be battery voltage.

Blown No. 60 (50 A) fuse in the under-dash fuse/relay box
Faulty ignition switch
An open or high resistance in the wire

GRN

Under all conditions

Connect terminal A7 to battery power: The windshield wiper motor should run at high speed.

Poor ground (G401) or an open in the ground wire
Faulty windshield wiper motor
An open or high resistance in the wire

A14

BLU

Under all conditions

Connect terminal A14 to battery power: The windshield wiper motor should run at low speed.

A34

WHT

Under all conditions

Connect terminal A34 to battery power and terminal A35 to body ground: The windshield/rear window washer motor should run.

Faulty windshield/rear window washer motor
An open or high resistance in the wire

A35

GRN

Under all conditions

Connect terminal A35 to battery power and terminal A34 to body ground: The windshield/rear window washer motor should run.

Faulty windshield/rear window washer motor
An open or high resistance in the wire

B20

BLU

The motor stops at auto-stop position.

Check for continuity to ground: There should be no continuity.

Faulty windshield wiper motor
A short to ground in the wire

Connect the terminal A14 to battery power momentarily, and stop the motor operation before the motor reaches the auto-stop position.

Check for continuity to ground: should be continuity.

Faulty windshield wiper motor
Poor ground (G401) or an open in the ground wire
An open or high resistance in the wire

Q7⁽¹⁾
.
Q5

PNK
.
BLK

Windshield wiper/washer switch (intermittent dwell timer) turned

Check resistance between the terminals: The resistance should vary between 0 to 1 kΩ.

Faulty windshield wiper/washer switch
An open or high resistance in the wire

C39
.
C29

PUR
.
BRN

Connect battery power to terminal C39, then connect terminal C29 to body ground momentarily.

Check rear window wiper motor operation: The rear window wiper motor should run and stop at the park position.

Faulty rear window wiper motor
Poor ground (G801) or an open in the ground wire
An open or high resistance in the wire

⁽¹⁾	With intermittent dwell time controller

Reconnect the connectors to the under-dash fuse/relay box, turn the ignition switch to ON (II), 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, the MICU must be faulty; replace the under-dash fuse/relay box:

USA models (see REMOVAL AND INSTALLATION ).
Canada models (see CANADA MODELS ).

WIRE SPECIFICATIONS

Cavity	Wire	Test condition	Test: Desired result	Possible cause if desired result is not obtained
K10	BLK	In all ignition switch positions	Measure the voltage to ground: There should be less than 0.2 V.	Poor ground (G502) or an open in the ground wire An open or high resistance in the wire
M16	BLK	In all ignition switch positions	Measure the voltage to ground: There should be less than 0.2 V.	Poor ground (G502) or an open in the ground wire An open or high resistance in the wire
N2	BLK	In all ignition switch positions	Measure the voltage to ground: There should be less than 0.2 V.	Poor ground (G501) or an open in the ground wire An open or high resistance in the wire
Q9	BLK	In all ignition switch positions	Measure the voltage to ground: There should be less than 0.2 V.	Poor ground (G501) or an open in the ground wire An open or high resistance in the wire
B26	PNK	Transmission range switch in R	Measure the voltage to ground: There should be less than 0.2 V.	Poor ground (G101) or an open in the ground wire Faulty or improperly transmission range switch An open or high resistance in the wire
B26	PNK	Transmission range switch in any other position than R	Measure the voltage to ground: There should be at least 5 V.	Faulty or improperly transmission range switch A short to ground in the wire
M10 . Q5	RED . BLK	Windshield wiper/washer switch (LO or HI) ON	Measure the voltage between terminals M10 and Q5: There should be less than 0.2 V.	Faulty windshield wiper/washer switch Poor ground (G501, G502) or an open in the ground wire An open or high resistance in the wire
M10 . Q5	RED . BLK	Windshield wiper/washer switch OFF	Measure the voltage between terminals M10 and Q5: There should be at least 5 V.	Faulty windshield wiper/washer switch
M11 . Q5	ORN . BLK	Windshield wiper/washer switch (INT or LO) ON	Measure the voltage between terminals M11 and Q5: There should be less than 0.2 V.	Faulty windshield wiper/washer switch Poor ground (G501, G502) or an open in the ground wire An open or high resistance in the wire
M11 . Q5	ORN . BLK	Windshield wiper/washer switch OFF	Measure the voltage between terminals M11 and Q5: There should be at least 5 V.	Faulty windshield wiper/washer switch
M12 . Q5	GRN . BLK	Windshield wiper/washer switch (MIST) ON	Measure the voltage between terminals M12 and Q5: There should be less than 0.2 V.	Faulty windshield wiper/washer switch Poor ground (G501, G502) or an open in the ground wire An open or high resistance in the wire
M12 . Q5	GRN . BLK	Windshield wiper/washer switch OFF	Measure the voltage between terminals M12 and Q5: There should be at least 5 V.	Faulty windshield wiper/washer switch
M13 . Q5	PUR . BLK	Washer switch ON	Measure the voltage between terminals M13 and Q5: There should be less than 0.2 V.	Faulty windshield wiper/washer switch Poor ground (G501, G502) or an open in the ground wire An open or high resistance in the wire
M13 . Q5	PUR . BLK	Washer switch OFF	Measure the voltage between terminals M13 and Q5: There should be at least 5 V.	Faulty windshield wiper/washer switch
M14 . Q5	YEL . BLK	Rear window wiper/washer switch (RR WIPER) ON	Measure the voltage between terminals M14 and Q5: There should be less than 0.2 V.	Faulty rear window wiper/washer switch Poor ground (G501, G502) or an open in the ground wire An open or high resistance in the wire
M14 . Q5	YEL . BLK	Rear window wiper/washer switch OFF	Measure the voltage between terminals M14 and Q5: There should be at least 5 V.	Faulty rear window wiper/washer switch
M15 . Q5	BLU . BLK	Rear window wiper/washer switch (RR WASH) ON	Measure the voltage between terminals M15 and Q5: There should be less than 0.2 V.	Faulty rear window wiper/washer switch Poor ground (G501, G502) or an open in the ground wire An open or high resistance in the wire
M15 . Q5	BLU . BLK	Rear window wiper/washer switch OFF	Measure the voltage between terminals M15 and Q5: There should be at least 5 V.	Faulty rear window wiper/washer switch