Safety Indicator System (MICU And Gauge Control Module) Input Test

NOTE:

Refer to Circuit Diagram the Electrical Wiring Diagrams for the location of the under-dash fuse/relay box connectors.
Before testing, troubleshoot the multiplex integrated control unit first, using B-CAN System Diagnosis Test Mode A - Refer to: Body Electrical Troubleshooting - B-CAN System Diagnosis Test Mode A - Initial Communication and DTC Checks .
Before testing, do the gauge control module self-diagnostic function to make sure the beeper and the indicators in the gauge control module work properly and the F-CAN line are OK.
Before testing, make sure the No. A21 (10 A) fuse in the under-hood fuse/relay box is OK.
Before testing, make sure the No. B5 (10 A) fuse in the under-dash fuse/relay box is OK.

MICU

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

2. Disconnect under-dash fuse/relay box connectors D, E, P and S

NOTE: All connector views are shown from the wire side of the 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. Reconnect the connectors to the under-dash fuse/relay box, 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 5.

Cavity	Wire	Test condition	Test: Desired result	Possible cause if desired result is not obtained
E6 *	BLK	In all power modes	Measure the voltage to ground: There should be less than 0.2 V.	Poor ground (G401) An open or high resistance in the ground wire
P1	BLK	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
D3 *	BLK	In all power modes	Measure the voltage to ground: There should be less than 0.2 V.	Poor ground (G601) An open or high resistance in the ground wire
D30	BLK	In all power modes	Measure the voltage to ground: There should be less than 0.2 V.	Poor ground (G601) An open or high resistance in the ground wire
D22	BRN	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
D22	BRN	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
S13	LT GRN	Front passenger's door open	Measure the voltage to ground: There should be less than 0.2 V.	Faulty front passenger's door switch Faulty front passenger's door switch ground An open or high resistance in the wire
S13	LT GRN	Front passenger's door closed	Measure the voltage to ground: There should be about 5 V.	Faulty front passenger's door switch A short to ground in the wire
D23	LT GRN	Left rear door open	Measure the voltage to ground: There should be less than 0.2 V.	Faulty left rear door switch Faulty left rear door switch ground An open or high resistance in the wire
D23	LT GRN	Left rear door closed	Measure the voltage to ground: There should be about 5 V.	Faulty left rear door switch A short to ground in the wire
S14	YEL	Right rear door open	Measure the voltage to ground: There should be less than 0.2 V.	Faulty right rear door switch Faulty right rear door switch ground An open or high resistance in the wire
S14	YEL	Right rear door closed	Measure the voltage to ground: There should be about 5 V.	Faulty right rear door switch A short to ground in the wire

*:'14-15

Cavity	Wire	Test condition	Test: Desired result	Possible cause if desired result is not obtained
D37	WHT	Trunk open	Measure the voltage to ground: There should be less than 0.2 V.	Faulty trunk lid latch switch Poor ground (G603) or an open in the ground wire An open or high resistance in the wire
D37	WHT	Trunk closed	Measure the voltage to ground: There should be about 5 V.	Faulty trunk lid latch switch A short to ground in the wire

*:'14-15

Gauge Control Module

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

6. Disconnect the gauge control module connector A (32P)

Courtesy of HONDA, U.S.A., INC.

7. 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 8.

8. 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, go to step 9.

Cavity	Wire	Test condition	Test: Desired result	Possible cause if desired result is not obtained
A1	WHT	Under all conditions	Measure the voltage to ground: There should be battery voltage.	Blown No. A21 (10 A) fuse in the under-hood fuse/relay box Faulty under-dash fuse/relay box An open or high resistance in the wire
A4	BRN	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
A17	BRN	Turn the vehicle to the ON mode	Measure the voltage to ground: There should be battery voltage.	Blown No. B5 (10A) fuse in the under-dash fuse/relay box An open or high resistance in the wire

9. If multiple failures are found on more than one control unit, replace the under-dash fuse/relay box (includes the MICU). If input failures are related to a particular control unit, replace the gauge control module .