Control Unit Input Test

NOTE:

Before testing, troubleshoot the multiplex integrated control system first, using B-CAN System Diagnosis Test Mode A (see TROUBLESHOOTING - B-CAN SYSTEM DIAGNOSIS TEST MODE A ).
Before testing, do the gauge control module self-diagnostic function (see SELF-DIAGNOSTIC FUNCTION ) to make sure the door indicator LED and the B-CAN communication line are OK.

MICU

Turn the ignition switch to LOCK (0).
Remove the fuse lid panel (see FUSE LID PANEL REMOVAL/INSTALLATION ), and remove the driver's dashboard lower cover (see DRIVER'S DASHBOARD LOWER COVER REMOVAL/INSTALLATION ).
Disconnect under-dash fuse/relay box connectors D, N, Q, R, Y, and AD.
NOTE: All connector views are wire side of female terminals.

Fig 1: Identifying Control Unit Input Test Connectors
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.

Reconnect the connectors, 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, go to step 6.

CONTROL UNIT INPUT TEST VOLTAGE REFERENCE CHART

Cavity	Wire	Test condition	Test: Desired result	Possible cause if desired result is not obtained
N5	BLK	In all ignition switch positions	Measure the voltage to ground: There should be less than 0.2 V.	Poor ground (G502) An open or high resistance in the wire
Y16	BLK	In all ignition switch positions	Measure the voltage to ground: There should be less than 0.2 V.	Poor ground (G501) An open or high resistance in the wire
R2	BLK	In all ignition switch positions	Measure the voltage to ground: There should be less than 0.2 V.	Poor ground (G501) An open or high resistance in the wire
02	BLK	In all ignition switch positions	Measure the voltage to ground: There should be less than 0.2 V.	Poor ground (G502) An open or high resistance in the wire
AD1	YEL	Ignition switch ON (II)	Measure the voltage to ground: There should be battery voltage.	Blown No. B60 (50 A) fuse in the under-dash fuse/relay box Faulty ignition switch An open or high resistance in the wire
D26	PNK	Driver's door open	Measure the voltage to ground: There should be less than 0.2 V.	Faulty driver's door switch Faulty driver's door switch ground An open or high resistance in the wire
D26	PNK	Driver's door closed	Measure the voltage to ground: There should be about 5 V.	Faulty driver's door switch A short to ground in the wire
D27	BRN	Passenger's door open	Measure the voltage to ground: There should be less than 0.2 V.	Faulty passenger's door switch Faulty passenger's door switch ground An open or high resistance in the wire
D27	BRN	Passenger's door closed	Measure the voltage to ground: There should be about 5 V.	Faulty passenger's door switch A short to ground in the wire
D17	ORN	Hatch open	Measure the voltage to ground: There should be less than 0.2 V.	Faulty hatch latch switch An open or high resistance in the wire
D17	ORN	Hatch closed	Measure the voltage to ground: There should be about 5 V.	Faulty hatch latch switch Poor ground (G801) or an open in the ground wire A short to ground in the wire

Gauge control module

Turn the ignition switch to LOCK (0).
Remove the gauge control module (see GAUGE CONTROL MODULE REPLACEMENT ), and disconnect the 32P connector from it.

Fig 2: Identifying Gauge Control Module 32P Connector
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 9.

Reconnect the connector to the gauge control module, 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, go to step 10.

CONTROL UNIT INPUT TEST VOLTAGE REFERENCE CHART

Cavity	Wire	Test condition	Test: Desired result	Possible cause if desired result is not obtained
4	BLK	In all ignition switch positions	Measure the voltage to ground: There should be less than 0.2 V.	Poor ground (G501) An open or high resistance in the wire
32	BLK	In all ignition switch positions	Measure the voltage to ground: There should be less than 0.2 V.	Poor ground (G501) An open or high resistance in the wire
17	LT BLU	Ignition switch ON (II)	Measure the voltage to ground: There should be battery voltage.	Blown No. B22 (7.5 A) fuse in the under-dash fuse/relay box Faulty under-dash fuse/relay box An open or high resistance in the wire
1	PNK	Under all conditions	Measure the voltage to ground: There should be battery voltage.	Blown No. B1 (15 A) fuse in the under-dash fuse/relay box An open or high resistance in the wire

Substitute a known-good gauge control module, and recheck the system.
- If the symptom is gone, the gauge control module is faulty: replace it (see GAUGE CONTROL MODULE REPLACEMENT ).
- If the symptom is still present, the MICU is faulty; replace the under-dash fuse/relay box:
  - USA models (see REMOVAL AND INSTALLATION )
  - Canada models (see CANADA MODELS )