Multiplex Intergrated Control System: Diagnosis Honda Odyssey III

Troubleshooting CAN Circuit Related Problems

Note. Check the PCM for DTCs and troubleshoot PCM or F-CAN loss of communication errors first (see GENERAL TROUBLESHOOTING INFORMATION ).

Loss of Communication DTC cross-reference chart

When an ECU is unable to communicate with the other ECUs on the CAN circuit, the other control units will set loss of communication DTCs. Use this chart to find the control unit that is not communicating.

1. Find the Transmitting Control Unit that is in the same row as all of the loss of communication DTCs retrieved shown in «LOSS OF COMMUNICATION DTC CROSS-REFERENCE»(ref-220996-S38674408362006022200000) .
2. Perform the input test for the transmitting control unit.

LOSS OF COMMUNICATION DTC CROSS-REFERENCE

DTC Troubleshooting Index

Note. Check the PCM for DTCs and troubleshoot PCM or F-CAN loss of communication errors first (see GENERAL TROUBLESHOOTING INFORMATION ), then record all DTCs, and sort them by DTC type using the DTC troubleshooting index, then troubleshoot the DTC(s) in this order

1. Battery voltage DTCs
2. Internal error DTCs
3. Loss of communication DTCs (beginning with the lowest number first; for example, if B1006 and B1059 are retrieved, troubleshoot B1006 first).
4. Signal error DTCs

DTC TROUBLESHOOTING INDEX

Diagnostic Trouble Codes (DTC)

There are three types of DTCs used by the CAN networks.

DIAGNOSTIC TROUBLE CODES (DTC)

Test Mode 1

Check the PCM for DTCs and troubleshoot PCM or F-CAN loss of communication errors first (see GENERAL TROUBLESHOOTING INFORMATION ), then perform this diagnosis if the HDS is not available.

Scheme 16

1. Check the No. 7 (7.5 A) fuse and No. 21 (7.5 A) fuse 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.
2. Remove the left kick panel (see «TRIM REMOVAL/INSTALLATION - DOOR AREAS»(ref-220969-S01393579752006022200000) ).
3. Turn the ignition switch ON (II), and move the interior lights switch to the middle (door) position.
4. Connect the MPCS service connector (A) to the MCIC socket (B) in the driver's under-dash fuse/relay box.
5. Wait 5 seconds, and watch the map lights. When the front and rear map lights flash quickly once, and a double beep is heard, the system is in Test Mode 1.
6. Check for B-CAN DTCs indicated by the gauge control module odometer/trip meter display or the multi-information display while still in Test Mode 1. Push the trip meter select/reset knob to display the next code. After you get to the last code, the display shows END. Are any DTCs indicated? YES - Go to step 7. NO - Go to step 10 .
7. Record all DTCs and sort them by type using the DTC Troubleshooting Index.
8. Troubleshoot the DTCs in this order: Battery voltage DTCs Internal error DTCs Loss of communication DTCs (begin with the lowest number first; for example, if B1006 and B1059 are retrieved, troubleshoot B1006 first) Signal error DTCs
9. Clear the DTCs by pressing and holding the select/reset knob for about 13 seconds. You will hear a beep to confirm the codes have been cleared. Operate the devices that failed, and recheck for codes. Test Mode 2
10. 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 service connector is disconnected for too short or too long of a time, or the ignition switch is turned OFF, the system will return to Test Mode 1.
11. 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

RELAY CONTROL MODULE

COMBINATION SWITCH CONTROL UNIT

POWER WINDOW MASTER SWITCH (DOOR MULTIPLEX CONTROL UNIT)

GAUGE CONTROL MODULE

POWER SEAT CONTROL UNIT

MICU-REAR JUNCTION BOX

POWER TAILGATE CONTROL UNIT

LEFT POWER SLIDING DOOR CONTROL UNIT

RIGHT POWER SLIDING DOOR CONTROL UNIT

Do the map lights indicate proper switch operation?

1. YES - Go to function and input test for the system related to the failure.
2. NO - Repair the open, short, or replace the faulty switch.

How to clear the DTC

While in Test Mode 1, press and hold down the SELECT/RESET switch button for more than 13 seconds.

Scheme 17

Scheme 18

Scheme 19

DTC INDEX

DTC INDEX

Multiplex Integrated Control Unit Input Test

Note. Make sure the ignition switch is OFF before troubleshooting the driver's under-dash fuse/relay box connectors.

Scheme 20

Scheme 21

1. Remove the left side kick panel (see «TRIM REMOVAL/INSTALLATION - DOOR AREAS»(ref-220969-S01393579752006022200000) ).
2. Disconnect the driver's under-dash fuse/relay box connectors. NOTE: All connector views are wire side of female terminals.
3. 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 4.
4. With the connectors still disconnected from the under-dash fuse/relay box, make these input tests at the connector(s). 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. UNDER-DASH FUSE/RELAY BOX Cavity Wire Test condition Test: Desired result Possible cause if result is not obtained E9 H9 BLK Under all conditions Check for continuity to ground: There should be continuity. Poor ground (G601) An open in the wire P14 BLK Under all conditions Check for continuity to ground: There should be continuity. Poor ground (G401) An open in the wire D11 BLU Under all conditions Check for continuity between the D11 terminal and the relay control module connector K (10P) No. 8 terminal: There should be continuity. An open in the wire Relay control module connector K (10P) disconnected Check for continuity to ground: There should be no continuity. Short to ground G1 GRN/RED Under all conditions Check for continuity between the G1 terminal and the MICU-rear junction box connector A (14P) No. 14 terminal: There should be continuity. An open in the wire MICU-rear junction box connector A (14P) disconnected Check for continuity to ground: There should be no continuity. Short to ground J4 GRN/RED Under all conditions Check for continuity between the J4 terminal and the power window master switch connector (23P) No. 16 terminal: There should be continuity. An open in the wire Power window master switch (Door multiplex control unit) connector (23P) disconnected Check for continuity to ground: There should be no continuity. Short to ground N22 LT BLU Under all conditions Check for continuity between the N22 terminal and the A/C control panel connector A (22P) No. 10 terminal (or climate control unit) connector (30P) No. 7 terminal: There should be continuity. An open in the wire A/C control panel (or climate control unit) connector (22P or 30P) disconnected Check for continuity to ground: There should be no continuity. Short to ground N28 BRN/YEL Under all conditions Check for continuity between the N28 terminal and the gauge control module connector A (30P) No. 25 terminal: There should be continuity. An open in the wire Gauge control module connector A (30P) disconnected Check for continuity to ground: There should be no continuity. Short to ground X18 LT GRN Under all conditions Check for continuity between the X18 terminal and the automatic lighting control unit connector (14P) No. 4 terminal: There should be continuity. An open in the wire Automatic lighting control unit connector (14P) disconnected Check for continuity to ground: There should be no continuity. Short to ground X27 LT GRN Under all conditions Check for continuity between the X27 terminal and the wiper/washer connector (8P) No. 4 terminal: There should be continuity. An open in the wire Wiper/washer switch connector (8P) disconnected Check for continuity to ground: There should be no continuity. Short to ground
5. Reconnect the connectors to the driver's under-dash fuse/relay box, and make sure these input tests at the appropriate connectors on the driver's under-dash fuse/relay box. 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 driver's under-dash fuse/relay box assembly. DRIVER'S UNDER-DASH FUSE/RELAY BOX Cavity Wire Test condition Test: Desired result Possible cause if result is not obtained P8 WHT/BLK Under all conditions Attach to ground: The ignition key light should come on. Blown No. 13 (20 A) fuse in the under-hood fuse/relay box Faulty LED An open in the wire W4 YEL Interior lights switch in the middle position, all doors closed Attach to ground: The individual map lights should come on. Blown No. 6 (7.5 A) fuse in the driver's under-dash fuse/relay box Faulty map light An open in the wire D6 *F1*J9*X34 YEL Ignition switch ON (II) Check for voltage to ground: There should be battery voltage. Blown No. 21 (7.5 A) fuse in the driver's under-dash fuse/relay box An open in the wire K5 * G3 * X35 WHT/RED Under all conditions Check for voltage to ground: There should be battery voltage. Blown No. 7 (7.5 A) fuse in the driver's under-dash fuse/relay box An open in the wire

Scheme 22

1. Remove the gauge control module (see «GAUGE CONTROL MODULE REPLACEMENT»(ref-221006-S24025336042006022200000) ).
2. Disconnect connector A (30P) from the gauge control module.
3. 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 4.
4. Reconnect connector A to the gauge control module, and make these input tests at the connector. If any test indicates a problem, find and correct the cause, then recheck the system. If all the input tests prove OK, replace the gauge control module. POSSIBLE CAUSE Cavity Wire Test condition Test: Desired result Possible cause if result is not obtained A6 WHT/RED Under all conditions Check for voltage to ground: There should be battery voltage. Blown No. 7 (7.5 A) fuse in the driver's under-dash fuse/relay box An open in the wire A5 YEL Ignition switch ON (II) Check for voltage to ground: There should be battery voltage. Blown No. 21 (7.5 A) fuse in the driver's under-dash fuse/relay box An open in the wire A20 BLK Under all conditions Check for voltage to ground: There should be less than 1 V. Poor ground (G502) An open in the wire A20 A25 BRN/YEL Under all conditions Check for continuity between the A25 terminal and the driver's under-dash fuse/relay box connector N (45P) No. 28 terminal: There should be continuity. An open in the wire

Door Multiplex Control Unit Input Test

Note. Make sure the ignition switch is OFF before disconnecting the driver's door switch panel.

Scheme 23

1. Remove the driver's door switch panel (see «MASTER SWITCH REPLACEMENT»(ref-221004-S28848878652006022200000) ).
2. Disconnect the 23P connector from the power window master switch.
3. 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 4.
4. Reconnect the connector to the door multiplex control unit and make these input tests at the connector. If any test indicates a problem, find and correct the cause, then recheck the system. If all the input tests prove OK, the door multiplex control unit must be faulty, replace the power window master switch. POSSIBLE CAUSE Cavity Wire Test condition Test: Desired result Possible cause if result is not obtained 15 WHT/RED Under all conditions Check for voltage to ground: There should be battery voltage. Blown No. 7 (7.5 A) fuse in the driver's under-dash fuse/relay box An open in the wire 20 YEL Ignition switch ON (II) Check for voltage to ground: There should be battery voltage. Blown No. 21 (7.5 A) fuse in the driver's under-dash fuse/relay box An open in the wire 1 BLK Under all conditions Check for voltage to ground: There should be less than 1 V. Poor ground (G601) An open in the wire 16 GRN/RED Under all conditions Check for continuity between No. 16 terminal and the driver's under-dash fuse/relay box connector J (21P) No. 4 terminal: There should be continuity. An open in the wire

Scheme 24

1. Remove the steering column covers (see «STEERING COLUMN REMOVAL AND INSTALLATION»(ref-220959-S32189971242006022100000) ).
2. Disconnect the 8P connector from the wiper/washer switch.
3. 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 4.
4. Reconnect the connector to the control unit, and make these input tests at the connector. If any test indicates a problem, find and correct the cause, then recheck the system. If all the input tests prove OK, the combination switch control unit must be faulty, replace the wiper/washer switch. POSSIBLE CAUSE Cavity Wire Test condition Test: Desired result Possible cause if result is not obtained 3 BLK Under all conditions Check for voltage to ground: There should be less than 1 V. Poor ground (G601) An open in the wire 8 WHT/RED Under all conditions Check for voltage to ground: There should be battery voltage. Blown No. 7 (7.5 A) fuse in the driver's under-dash fuse/relay box An open in the wire 7 YEL Ignition switch ON (II) Check for voltage to ground: There should be battery voltage. Blown No. 21 (7.5 A) fuse in the driver's under-dash fuse/relay box An open in the wire 4 LT GRN Under all conditions Check for continuity between No. 4 terminal and the driver's under-dash fuse/relay box connector X (39P) No. 27 terminal: There should be continuity. An open in the wire

Scheme 25

1. Remove the under-hood fuse/relay box under cover (see «UNDER-HOOD FUSE/RELAY BOX»(ref-220991) ).
2. Disconnect the under-hood fuse/relay box connector K (10P).
3. 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 4.
4. Reconnect the connector to the under-hood fuse/relay box, and make these input tests at the connector. If any test indicates a problem, find and correct the cause, then recheck the system. If all the input tests prove OK, the relay control module must be faulty, replace the under-hood fuse/relay box. POSSIBLE CAUSE Cavity Wire Test condition Test: Desired result Possible cause if result is not obtained K10 BLK Under all conditions Check for voltage to ground: There should be less than 1 V. Poor ground (G202) An open in the wire K2 YEL Ignition switch ON (II) Check for voltage to ground: There should be battery voltage. Blown No. 21 (7.5 A) fuse in the driver's under-dash fuse/relay box An open in the wire K8 BLU Under all conditions Check for continuity between K8 terminal and the driver's under-dash fuse/relay box connector D (17P) No. 11 terminal: There should be continuity. An open in the wire

Scheme 26

1. Remove the right rear side trim (see «TRIM REMOVAL/INSTALLATION - PILLAR AREAS»(ref-220969-S00729794852006022200000) ).
2. Disconnect the MICU-rear junction box connectors A, C, D and G. NOTE: All connectors are wire side of female terminals.
3. 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 4.
4. Reconnect the connectors to the MICU-rear junction box and make these input tests at the appropriate connectors on the MICU-rear junction box. If any test indicates a problem, find and correct the cause, then recheck the system. If all the input tests prove OK, replace the MICU-rear junction box. POSSIBLE CAUSE Cavity Wire Test condition Test: Desired result Possible cause if result is not obtained A13 C1 BLK Under all conditions Check for voltage to ground: There should be less than 1 V. Poor ground (G652) An open in the wire A6 WHT/RED Under all conditions Check for voltage to ground: There should be battery voltage. Blown No. 7 (7.5 A) fuse in the driver's under-dash fuse/relay box An open in the wire A12 YEL Ignition switch ON (II) Check for voltage to ground: There should be battery voltage. Blown No. 21 (7.5 A) fuse in the driver's under-dash fuse/relay box An open in the wire D1 . D2 . G2 WHT/RED Under all conditions Check for voltage to ground: There should be battery voltage. Faulty MICU-rear junction box D3 . D4 . G3 YEL Ignition switch ON (II) Check for voltage to ground: There should be battery voltage. Faulty MICU-rear junction box