Gauge Control Module Input Test

NOTE:

Before testing, do the gauge control module self-diagnosis function (see SELF-DIAGNOSTIC FUNCTION ), and make sure the B-CAN communication lines are OK.
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 ).

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

Fig 1: Gauge Control Module 32P Connector Terminals Identification
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 are OK, go to step 4.

With the connector still disconnected, do the following input tests:

If any test indicates a problem, find and correct the cause, then recheck the system.

If the input test proves OK, go to step 5.

GAUGE CONTROL MODULE INPUT TEST RESULT

Cavity	Wire	Test condition	Test: Desired result	Possible cause if desired result is not obtained
16	BLU	Combination light switch ON	Connect to ground with a jumper wire: The dashlights should come on full bright.	Faulty bulbs An open or high resistance in the wire
15	RED	Combination light switch ON	Connect to ground with a jumper wire: The dashlights should come on full bright.	Faulty LEDs An open or high resistance in the wire
8	GRN	Ignition switch ON (II), turn signal switch in RIGHT	Measure the voltage to ground: There should be battery voltage when the lights are flashing.	Faulty MICU Faulty combination light switch An open or high resistance in the wire
7	BLU	Ignition switch ON (II), turn signal switch in LEFT	Measure the voltage to ground: There should be battery voltage when the lights are flashing.	Faulty MICU Faulty combination light switch An open or high resistance in the wire
23	WHT	Battery sensor 2P connector disconnected	Check for continuity between terminal No. 23 and battery sensor 2P connector terminal No. 1: There should be continuity.	An open in the UART wire
23	WHT	Battery sensor 2P connector disconnected	Check for continuity to ground: There should be no continuity.	A short to ground in the UART wire

Reconnect the 32P connector to the gauge control module, and do the following input tests:

If any test indicates a problem, find and correct the cause, then recheck the system.

If the input test proves OK, the gauge control module must be faulty; replace it (see GAUGE CONTROL MODULE REPLACEMENT ).

GAUGE CONTROL MODULE INPUT TEST RESULT

Cavity	Wire	Test condition	Test: Desired result	Possible cause if desired result is not obtained
1	GRN	Under all conditions	Measure the voltage to ground: There should be battery voltage.	Blown No. B16 (10 A) fuse in the under-hood fuse/relay box An open or high resistance in the wire
17	GRN	Ignition switch ON (II)	Measure the voltage to ground: There should be battery voltage.	Blown No. C11 (7.5 A) fuse in the driver's under-dash fuse/relay box An open or high resistance in the wire
4	BLK	In all ignition switch positions	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
31	BRN	In all ignition switch positions	Measure the voltage to ground: There should be less than 0.2 V.	Poor ground (G402) An open or high resistance in the ground wire
32	BRN	In all ignition switch positions	Measure the voltage to ground: There should be less than 0.2 V.	Poor ground (G402) An open or high resistance in the ground wire
12	GRY	Ignition switch ON (II), washer fluid is full level in the reservoir	Measure the voltage to ground: There should be about 5 V.	Faulty brake fluid level switch A short to ground in the wire
12	GRY	Ignition switch ON (II), washer fluid is at a lower level in the reservoir	Measure the voltage to ground: There should be less than 0.2 V.	Faulty washer fluid level switch Poor ground (G204) or an open in the ground wire An open or high resistance in the wire
27	ORN	Ignition switch ON (II), brake fluid level is full in the reservoir	Measure the voltage to ground: There should be battery voltage.	Faulty brake fluid level switch A short to ground in the wire
27	ORN	Ignition switch ON (II), brake fluid level is lower in the reservoir	Measure the voltage to ground: There should be less than 0.2 V.	Faulty brake fluid level switch Poor ground (G302) or an open in the ground wire An open or high resistance in the wire
28	YEL	Ignition switch ON (II), parking pedal released	Measure the voltage to ground: There should be battery voltage.	Faulty brake fluid level switch A short to ground in the wire
28	YEL	Ignition switch ON (II), parking pedal pressed	Measure the voltage to ground: There should be less than 0.2 V.	Faulty parking brake switch Faulty parking brake switch ground An open or high resistance in the wire