Test Mode 1

Do this diagnosis if the HDS is not available.

Check the No. 7 (10 A) and No. 21 (10 A) fuses in the driver's under-dash fuse/relay box.
Are the fuses OK?

YES -Go to step 2.

NO -Find and repair the cause of the blown fuse.
Remove the left kick panel (see TRIM REMOVAL/INSTALLATION - DOOR AREAS ), and the driver's dashboard under cover.
Turn the ignition switch to ON (II), and move the interior lights switch to the "DOOR" position.
Connect the MPCS service connector (A) to the MCIC socket (B) in the driver's under-dash fuse/ relay box.

Fig 1: Connecting MPCS Service Connector To MCIC Socket
Courtesy of AMERICAN HONDA MOTOR CO., INC.
Wait 5 seconds, and watch the map lights. When the system enters Mode 1, the front and rear map lights will flash quickly once, and a double beep will be heard.
If there is a DTC, the map lights and ignition key light will blink, pause, then repeat the DTC as long as the ignition switch is turned to ON (II).
Is there a repeating DTC?

YES -Count the blinks, then go to step 7.

NO -Go to step 8.

About 1 second after you go into self-diagnostic Mode 1, the map lights will indicate the DTC, and repeat it every 3 seconds. If there is more than one DTC, the system will indicate them in ascending order, beginning with the DTC with the lowest numerical value. Troubleshoot the DTCs as indicated below:

DTC 2, 3, 4 and 5 simultaneously: Check for an open in the LT GRN wire between MICU D11 and relay control module J7, LT GRN wire between MICU N28 and combination switch control unit No. 4, LT GRN wire between MICU J4 and driver's MPCS unit A28, and LT GRN wire between MICU N22 and gauge control module B17. If the wire is OK, substitute a known-good driver's under-dash fuse/relay box, under-hood fuse/relay box, gauge control module, wiper/washer switch, and driver's MPCS unit one at a time, in that order, and recheck for the DTCs after each substitution.
DTC 1 only: Go to MICU input test (see MICU INPUT TEST ).
DTC 2 only (no other DTCs present): Go to the relay control module input test (see RELAY CONTROL MODULE INPUT TEST ). If all inputs are OK, substitute a known-good relay control module and then a MICU, one at a time, and then check for DTCs. If a DTC recurs after a substitution, replace that unit.
DTC 3 only (no other DTCs present): Go to the driver's MPCS unit input test (see DRIVER'S MPCS UNIT INPUT TEST ). If all inputs are OK, substitute a known-good driver's MPCS unit and then a MICU, one at a time, and then check for DTCs. If a DTC recurs after a substitution, replace that unit.
DTC 4 only (no other DTCs present): Go to the combination switch control unit input test (see COMBINATION SWITCH CONTROL UNIT INPUT TEST ). If all inputs are OK, substitute a known-good wiper/washer switch and then a MICU, one at a time, and then check for DTCs. If a DTC recurs after a substitution, replace that unit.
DTC 5 only (no other DTCs present): Go to the gauge control module input test (see GAUGE CONTROL MODULE INPUT TEST ). If all inputs are OK, substitute a known-good gauge control module and then a MICU, one at a time, and then check for DTCs. If a DTC recurs after a substitution, replace that unit.

DTC DESCRIPTION

DTC	Cause
1	The MICU cannot receive signals from the BUS communication line.
2	The MICU cannot receive signals from the relay control module communication line.
3	The MICU cannot receive signals from the driver's MPCS communication line.
4	The MICU cannot receive signals from the combination switch communication line.
5	The MICU cannot receive signals from the gauge control module.

Check for B-CAN DTCs indicated by the gauge control module (see GAUGE CONTROL MODULE DTC DISPLAY ).
Are any DTCs indicated?

YES -Go to step 9.

NO -Go to step 11.
Record all DTCs and sort them by type using the DTC Troubleshooting.
Troubleshoot the DTCs in these order:
- Battery voltage DTCs
- Internal error DTCs
- Loss of communication DTCs (begin with the lowest number first; for example, if DTC B1005 and B1008 are retrieved, troubleshoot B1005 first)
- Signal error DTCs
Test Mode 2
Remove the MPCS service connector from the driver's under-dash fuse/relay box socket for 5-10 seconds, then re-insert it to enter Mode 2. When the system enters Mode 2, the front and rear map lights will flash two times quickly.
NOTE: If the MPCS connector is disconnected for too short or too long of a time, or the ignition switch is turned to LOCK (0), the system will return to Test Mode 1.

The following tables list the circuits that can be checked in Test Mode 2. Operate the switch that is most closely related to the problem. If the circuit is OK, the map lights will blink once. If the circuit is faulty, there will be no indication.

MICU

ITEM SPECIFICATION

Item

Driver's door switch (OPEN)

Front passenger's door switch (OPEN)

Left rear door switch (OPEN)

Right rear door switch (OPEN)

Trunk lid latch switch (OPEN)

Front passenger's door lock knob switch (UNLOCK)⁽¹⁾

Left rear door lock knob switch (UNLOCK)

Right rear door lock knob switch (UNLOCK)⁽¹⁾

Audio security ground (when disconnected)

Driver's seat belt buckle switch (unbuckled)

Brake pedal position switch (ON; brake pedal pressed)

Passenger's door lock switch (LOCK/UNLOCK)

Mirror select switch (LEFT, CENTER, RIGHT)

Mirror switch (LEFT, RIGHT, UP, DOWN)

⁽¹⁾	The front passenger's and door lock knob switches must be in the locked position when beginning the test.

RELAY CONTROL MODULE

ITEM SPECIFICATION

Item
Windshield wiper switch (AUTO STOP/PARK)
Security hood switch (OPEN)
A/C pressure switch/thermal protector (A/C ON)

COMBINATION SWITCH CONTROL UNIT

ITEM SPECIFICATION

Item
Turn signal switch (LEFT)
Turn signal switch (RIGHT)
Combination light switch (ON; each position)
Dimmer switch (ON)
Passing switch (ON)
Windshield wiper switch (ON)
Intermittent wiper dwell timer
Windshield washer switch (ON)

DRIVER'S MPCS UNIT

ITEM SPECIFICATION

Item

Power window master switch (Driver's window UP)

Power window master switch (Driver's window DOWN)

Power window master switch (Driver's window AUTO UP)

Power window master switch (Driver's window AUTO DOWN)

Power window master switch (Front passenger's window UP)

Power window master switch (Front passenger's window DOWN)

Power window master switch (Left rear window UP)

Power window master switch (Left rear window DOWN)

Power window master switch (Right rear window UP)

Power window master switch (Right rear window DOWN)

Driver's door key cylinder switch⁽¹⁾ (LOCK)

Driver's door key cylinder switch⁽¹⁾ (UNLOCK)

Driver's door lock switch (LOCK)

Driver's door lock switch (UNLOCK)

Driver's door lock knob switch (LOCK)

Driver's door lock knob switch (UNLOCK)

Driving position memory switches (1,2, memo)

Passenger's window switch (UP)

Passenger's window switch (DOWN)

Passenger's window switch (AUTO UP)

Passenger's window switch (AUTO DOWN)

Trunk lid opener switch (ON)

Fuel fill door opener switch (ON)

⁽¹⁾	A second key is necessary to check the key cylinder inputs.

Be sure to rotate the key cylinder switch two times to each position (lock and lock, unlock and unlock) to ensure the door lock knob switch is in the appropriate position.

GAUGE CONTROL MODULE

ITEM SPECIFICATION

Item
Parking brake switch (ON; parking brake applied)
Cruise control main SET/RESUME/CANCEL switch (ON; switch pressed)
Transmission range switch (P, R, N, D)
Washer fluid level switch (fluid removed) (Canada models)
Brake fluid level switch (fluid removed)
Illumination control switches (+, -)
MID switches (Select/Reset, < INFO, INFO>)

POWER SEAT CONTROL UNIT

ITEM SPECIFICATION

Item
Power seat slide switch (FORWARD, BACKWARD)
Power seat front up-down switch (UP, DOWN)
Power seat rear up-down switch (UP, DOWN)
Power seat recline switch (FORWARD, RECLINE)
Power tilt/telescopic steering switch (UP, DOWN, PUSH, PULL)
Rear head restraint tilt switch (ON)

Do the map lights indicate proper switch operation?

YES -Go to function and input test for the system related to the failure.

NO -Repair the open, short, or replace the faulty switch.