Multiplex Integrated Control System: Other Honda Odyssey IV

Using the HDS (Preferred method)

1. Go to B-CAN System Diagnosis Test Mode A to check for "Connected units" and DTCs (see «TROUBLESHOOTING - B-CAN SYSTEM DIAGNOSIS TEST MODE A»(ref-294731-S03650631412008081300000) ).
2. If no DTCs are retrieved, go to B-CAN System Diagnosis Test Mode C(see «TROUBLESHOOTING - B-CAN SYSTEM DIAGNOSIS TEST MODE C»(ref-294731-S23548620932008081300000) ) or D (see «TROUBLESHOOTING - B-CAN SYSTEM DIAGNOSIS TEST MODE D»(ref-294731-S37107684632008081300000) ).

Without HDS (Use only if the HDS is unavailable)

1. Check for communication circuit problems using B-CAN System Diagnosis Test (see «TROUBLESHOOTING - B-CAN SYSTEM DIAGNOSIS TEST MODE 1 AND TEST MODE 2 (WITHOUT THE HDS)»(ref-294731-S15549985512008081300000) ).
2. Check for DTCs (see «TROUBLESHOOTING - B-CAN SYSTEM DIAGNOSIS TEST MODE 1 AND TEST MODE 2 (WITHOUT THE HDS)»(ref-294731-S15549985512008081300000) ). NOTE: If the problem is related to the power seat control unit (with DPMS), check for DTCs first with the driving position memory system self-diagnostic function (see «GENERAL TROUBLESHOOTING INFORMATION»(ref-294763-S39587153862008081300000) ).
3. Sort, and then troubleshoot the DTCs in the order below. Battery voltage DTCs Internal error DTCs Loss of communication DTCs (beginning with the lowest number first; for example, if B1006 and B1059 are retrieved, troubleshoot B1006 first) Signal error DTCs
4. If no DTCs are retrieved, use B-CAN System Diagnosis Test Mode 2 to check all inputs related to failure (see step 10 on ).

Body Controller Area Network (B-CAN) and Fast Controller Area Network (F-CAN)

The body controller area network (B-CAN) and the fast controller area network (F-CAN) share information between multiple electronic control units (ECUs). B-CAN communication moves at a slower speed for convenience related items and for other functions. F-CAN information moves at a faster speed for real time functions such as fuel and emissions data. To allow both systems to share information, the gauge control module translates information from B-CAN to F-CAN and from F-CAN to B-CAN.

The ECUs on the B-CAN and the F-CAN transmit and receive information in the form of structured messages that may be received by several different ECUs on the network at one time. These messages are transmitted and received across a communication circuit that consists of a single wire that is shared by all the ECUs on the circuit. Since messages on the F-CAN are typically of higher importance, a second wire is used for communication circuit integrity monitoring. A backup circuit is also added to the headlight and wiper circuits on the B-CAN in the event of a network wire or ECU failure that would effect the operation of the system.

Scheme 13

Messages are transmitted by an ECU (that monitors an input) over the communication circuit. ECUs that use the message (information related to that input) are the receivers. For example, the combination switch control unit monitors the wiper switch. When the wiper switch is placed in the low speed position, the combination switch control unit transmits that message on the communication circuit. The relay control module receives the message and turns on the wipers by providing a ground for the relay.

Scheme 14

Connected ECUs

Several ECUs are connected to each of the two networks. The gauge control module is part of both networks since it is the gateway between them. Here is a list of ECUs and the network they are connected to.

B-CAN ECUs

1. Gauge control module
2. Relay control module
3. Multiplex integrated control unit (MICU)
4. Door multiplex control unit
5. Combination switch control unit
6. MICU-rear junction box
7. Power tailgate control unit
8. Power seat control unit
9. Left power sliding door control unit
10. Right power sliding door control unit
11. A/C control panel/Front climate control unit
12. Automatic lighting control unit
13. HandsFreeLink control unit

F-CAN ECUs

Scheme 15

1. Gauge control module
2. PCM
3. VSA modulator-control unit
4. ACM
5. TPMS control unit
6. SRS unit

Network "Loss of Communication" Error Checking

The B-CAN and the F-CAN send messages to each other to check the integrity of the network communication circuit. They do this by sending a specific digital message out after an event. For example, after turning the ignition switch to ON (II). All the ECUs on the communication circuit expect to receive a message from other specific units within a specified amount of time. If the message is not received, the ECU will transmit a DTC reporting that it did not receive the message.

Examples of a communication circuit test

Normal circuit

Scheme 16

1. Ignition switch is turned to ON (II).
2. The door multiplex control unit transmits a door switch message.
3. The multiplex integrated control unit (MICU), relay control module, and gauge control module receive the door lock switch message.
4. The communication circuit test is passed. Since the door lock switch message was received by all the ECUs expecting to receive a message, the communication circuit between those units is OK. There are multiple messages sent and received by each ECU during this time to insure that the communication circuit is intact. Failed circuit
5. Ignition switch is turned to ON (II).
6. The door multiplex control unit transmits a door switch message.
7. The multiplex integrated control unit (MICU), relay control module, and gauge control module expect to receive the door lock switch message, but since there is a break in the communication circuits, it is not received.
8. Each ECU that expects to receive the door lock switch message from the door multiplex control unit will transmit DTCs for the message that it did not receive.

Since there is a break in the communication circuit, the door lock switch message could not be received by the gauge control module, multiplex integrated control unit (MICU), or the relay control module. Each of these units will set "loss of communication" error codes for the message(s) they did not receive. There may be multiple communication DTCs if the unit that has become disconnected from the network would normally transmit multiple messages during the communication line test. For example, the door multiplex control unit sends the keyless panic message and door lock switch message during the communication circuit test.

B-CAN System Unit Input/Output Index

COMBINATION SWITCH CONTROL UNIT INPUT/OUTPUT CHART

RELAY CONTROL MODULE INPUT/OUTPUT CHART

DOOR MULTIPLEX CONTROL UNIT INPUT/OUTPUT CHART

MULTIPLEX INTEGRATED CONTROL UNIT INPUT/OUTPUT CHART

MICU-REAR JUNCTION BOX INPUT/OUTPUT CHART

POWER TAILGATE CONTROL UNIT INPUT/OUTPUT CHART

HANDSFREELINK CONTROL UNIT INPUT/OUTPUT CHART

GAUGE CONTROL MODULE INPUT/OUTPUT CHART

A/C CONTROL PANEL/FRONT CLIMATE CONTROL UNIT INPUT/OUTPUT CHART

POWER SEAT CONTROL UNIT INPUT/OUTPUT CHART

LEFT POWER SLIDING DOOR CONTROL UNIT INPUT/OUTPUT CHART

RIGHT POWER SLIDING DOOR CONTROL UNIT INPUT/OUTPUT CHART

AUTOMATIC LIGHTING CONTROL UNIT INPUT/OUTPUT CHART

POWER MIRROR CONTROL UNIT INPUT/OUTPUT CHART

HDS Inputs and Commands

Input

HDS INPUTS

Output

HDS OUTPUT DATA LIST

Troubleshooting - B-CAN System Diagnosis Test Mode A

Check the PCM for DTCs and troubleshoot PCM or F-CAN loss of communication errors first (see GENERAL TROUBLESHOOTING INFORMATION ), then perform this diagnosis first if the symptom is related to the B-CAN system.

Note. Always cycle the ignition switch within 3 seconds when prompted in the DTC troubleshooting procedures in this section.

1. Compare the system with this list of B-CAN related systems: Gauge control module Exterior lights Turn signals Entry light control Interior lights Safety indicators Rear window defogger Horns (security and panic) Chimes (key, seat belt, lights-on, and parking brake) Power windows Power window/moonroof timer Wiper/washer Security Keyless entry Power door locks Climate control Key interlock Dash light brightness Driving position memory Power tailgate Power sliding doors Compass HandsFreeLink control unit Is the symptom related to the B-CAN system? YES - Go to step 2. NO - Go to the system troubleshooting for the system with the symptom.
2. Connect the Honda Diagnosis System (HDS), then turn the ignition switch to ON (II).
3. From the BODY ELECTRICAL SYSTEM SELECTION MENU, select UNIT INFORMATION, and then select CONNECTED UNIT listed to see if the following control units are communicating with the HDS. MICU Door multiplex control unit Gauge control module Combination switch control unit Relay control module MICU-rear junction box Power seat control unit Power tailgate control unit Left power sliding door control unit Right power sliding door control unit A/C control panel/Front climate control unit Automatic lighting control unit HandsFreeLink control unit NOTE: If one or more of the units are communicating with the HDS, DETECT will be displayed. If the unit is not communicating or the vehicle is not equipped, "Not Available" is displayed. Are all control units communicating with the HDS? YES - Go to step 4. NO - If any of the control units are not communicating, go to «B-CAN SYSTEM DIAGNOSIS TEST MODE B»(ref-294731-S21850029552008081300000) . If all units are not communicating or only the MICU is communicating, go to DTC B1000 troubleshooting (see «DTC B1000: COMMUNICATION BUS LINE ERROR»(ref-294731-S00744770072008081300000) ).
4. Select the system that has the problem from the BODY ELECTRICAL SYSTEM SELECTION MENU, then select DTCs. Are any DTCs indicated? YES - Go to step 5. NO - If the problem is related to one of the following items, go to B-CAN System Diagnosis Test Mode C (see «TROUBLESHOOTING - B-CAN SYSTEM DIAGNOSIS TEST MODE C»(ref-294731-S23548620932008081300000) ). Exterior lights Turn signals Entry light control Interior lights Horns (security and panic) Power windows Wiper/washer Power tailgate Power sliding door Compass If the problem is related to one of the following items, go to the troubleshooting for that individual system. Gauge control module Safety indicators Chimes (key, seat belt and lights-on) Rear window defogger (climate control) Security Keyless entry Climate control Key interlock Dash light brightness Audio system Navigation Driving position memory Power tailgate Power sliding door Compass HandsFreeLink
5. Record all DTCs, and sort them by DTC type.
6. Troubleshoot the DTC(s) in this order: Battery voltage DTCs. Internal error DTCs. Loss of communication DTCs. Begin troubleshooting with the lowest number first (Example: if DTCs B1006 and B1058 are retrieved, begin by troubleshooting B1006). Signal error DTCs.

Troubleshooting - B-CAN System Diagnosis Test Mode B

Perform this diagnosis if any of the control units are not communicating (Not Available is displayed in the HDS) as found by the B-CAN System Diagnosis Test Mode A (see TROUBLESHOOTING - B-CAN SYSTEM DIAGNOSIS TEST MODE A ).

1. Using the HDS, select the system that has the symptom from the BODY ELECTRICAL SYSTEM SELECTION MENU.
2. Select DTCs, and then check for loss of communication DTCs (use the DTC Troubleshooting Index to find the DTC type) (see «DTC TROUBLESHOOTING INDEX»(ref-294731-S15879496112008081300000) ). Are any loss of communication DTCs indicated? YES - Go to step 3. NO - Replace the MICU.
3. Perform the input test for the unit not communicating with the HDS. NOTE: Troubleshoot MICU-rear junction box loss of communication DTCs before troubleshooting the left/right power sliding door control unit, the power tailgate control unit, and the power seat control unit DTCs. MICU REFERENCE Unit not communicating MICU (see «MICU INPUT TEST»(ref-294731-S02665497412008081300000) ) Door multiplex control unit (see «DOOR MULTIPLEX CONTROL UNIT INPUT TEST»(ref-294731-S28346332492008081300000) ) Gauge control module (see «GAUGE CONTROL MODULE INPUT TEST»(ref-294731-S42563116722008081300000) ) Relay control module (see «RELAY CONTROL MODULE INPUT TEST»(ref-294731-S34131669082008081300000) ) Combination switch control unit (see «COMBINATION SWITCH CONTROL UNIT INPUT TEST»(ref-294731-S14639546632008081300000) ) Power seat control unit (see «POWER SEAT CONTROL UNIT INPUT TEST»(ref-294763-S04625780982008081300000) ) MICU-rear junction box (see «MICU - REAR JUNCTION BOX INPUT TEST»(ref-294731-S23314594932008081300000) ) Power tailgate control unit (see «CONTROL UNIT INPUT TEST»(ref-294755-S38306007232008081300000) ) Left power sliding door control unit (see «CONTROL UNIT INPUT TEST»(ref-294743-S38109164562008081300000) ) Right power sliding door control unit (see «RIGHT POWER SLIDING DOOR»(ref-294743-S35047616812008081300000) ) A/C control panel (see «SYSTEM DESCRIPTION»(ref-294720-S16920315352008081300000) ) Front climate control unit (see «SYSTEM DESCRIPTION»(ref-294691-S05270250722008081300000) ) Automatic lighting control unit (see «AUTOMATIC LIGHTING CONTROL UNIT INPUT TEST»(ref-294707-S04573245532008081300000) ) HandsFreeLink control unit (see «CONTROL UNIT INPUT TEST»(ref-294765-S11344142382008081300000) )

Troubleshooting - B-CAN System Diagnosis Test Mode C

Perform this diagnosis if a component that is controlled by the B-CAN system does not stop or turn off.

Note. If the component does not turn on, go to B-CAN System Diagnosis Test Mode D (see TROUBLESHOOTING - B-CAN SYSTEM DIAGNOSIS TEST MODE D ). See the B-CAN system unit input/output index for a list of input and output devices and the control units that monitor the input and controls the output devices (see B-CAN SYSTEM UNIT INPUT/OUTPUT INDEX ). Always cycle the ignition switch within 3 seconds when prompted in the DTC troubleshooting procedures in this section.

1. Check for DTCs by selecting the TEST MODE MENU from the HDS. Are any DTCs indicated? YES - Go to B-CAN System Diagnosis Test Mode A (see «TROUBLESHOOTING - B-CAN SYSTEM DIAGNOSIS TEST MODE A»(ref-294731-S03650631412008081300000) ). NO - Go to step 2.
2. Turn off the switch that controls the malfunctioning component.
3. Select DATA LIST from the TEST MODE MENU, and check the input of the switch that controls the component. Does the HDS indicate the switch is OFF? YES - Go to step 4. NO - Go to step 6 .
4. In the DATA LIST, check the output signal of the malfunctioning component. Is the output signal OFF? YES - Go to step 5. NO - Replace the control unit that controls the device that will not turn OFF (see «B-CAN SYSTEM UNIT INPUT/OUTPUT INDEX»(ref-294731-S39801899482008081300000) ).
5. Test the relay that controls the device that does not stop or turn off, if applicable if the relay test OK, then check for a short in the wire between the relay and the component, the relay and control unit, or the component and control unit. Are the relay and the wire harness OK? YES - Replace the control unit that controls the component that will not turn OFF. NO - Replace the relay or repair the wire harness.
6. Test the switch, then check for a short in the wire between the switch and the control unit that monitors the switch. Is the switch and wire harness OK? YES - Replace the control unit that monitors the switch. NO - Replace the switch or repair the wire harness.

Troubleshooting - B-CAN System Diagnosis Test Mode D

Perform this diagnosis if a component that is controlled by the B-CAN system does not run or come on.

Note. If the component does not turn off or stop, go to B-CAN System Diagnosis Test Mode C (see TROUBLESHOOTING - B-CAN SYSTEM DIAGNOSIS TEST MODE C ). See the B-CAN system unit input/output index for a list of input and output devices and the control units that monitor the input and controls the output devices (see B-CAN SYSTEM UNIT INPUT/OUTPUT INDEX ). Always cycle the ignition switch within 3 seconds when prompted in the DTC troubleshooting procedures in this section.

1. Check the fuse of the malfunctioning output device. Is the fuse OK? YES - Go to step 2. NO - Replace the fuse and recheck.
2. Check for DTCs by selecting the TEST MODE MENU from the HDS. Are any DTCs indicated ? YES - Go to B-CAN System Diagnosis Test Mode A (see «TROUBLESHOOTING - B-CAN SYSTEM DIAGNOSIS TEST MODE A»(ref-294731-S03650631412008081300000) ). NO - Go to step 3.
3. Turn ON the switch that controls the malfunctioning component.
4. Select DATA LIST from the TEST MODE MENU, and check output signal for the malfunctioning component. Is there an output signal? YES - Go to step 5. NO - Go to step 9 .
5. Check the relay and ground, then check for an open or a short in the circuit for the malfunctioning component. Are the relay and circuit OK? YES - Go to step 6. NO - Replace the relay or repair the wire circuit.
6. Perform the function test for the malfunctioning component. Does the output device pass the function test? YES - Go to step 7. NO - Replace the component.
7. With the malfunctioning output device connected, connect a voltmeter between the malfunctioning output device and body ground on the wire that the control unit uses to control the output device circuit.
8. Select MISC. TEST from the TEST MODE MENU, and do the forced operation test of the malfunctioning component. Is there a change in voltage (12 V to 0 V or 0 V to 12 V)? YES - Inspect the ground for the component. If ok, replace the component. NO - Replace the control unit that controls the malfunctioning component.
9. Select DATA LIST from the TEST MODE MENU, and make sure the switch signal input for the malfunctioning system indicates a change when operated. Does the switch input indicated ON when the switch is ON? YES - Replace the control unit that controls the malfunctioning component. NO - Go to step 10.
10. Check the switch and its ground (if applicable), then check for an open or a short in the wire between the switch and the control unit that monitors it. Is the switch and the wire harness OK? YES - Replace the control unit that monitors the switch. NO - Replace the switch or repair the wire harness.

Troubleshooting - B-CAN System Diagnosis Test Mode 1 and Test Mode 2 (without the HDS)

Special Tools Required

MPCS (MCIC) service connector 07WAZ-001010A

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 17

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-294711-S28919579412008081300000) ).
3. Turn the ignition switch to 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 Model.
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 MICU REFERENCE Item Driver's door switch (OPEN) Front passenger's door switch (OPEN) Left rear door switch (OPEN) Right rear door switch (OPEN) Ignition key switch (inserted) Front passenger's door lock knob switch (UNLOCK) (1) Left sliding door lock knob switch (UNLOCK) (1) Right sliding door lock knob switch (UNLOCK) (1) Audio security ground (disconnected) Driver's seat belt switch (unbuckled) Brake pedal position switch (ON; brake pedal pressed) (1) The front passenger's and sliding door lock knob switches must be in the locked position when beginning the test. RELAY CONTROL MODULE RELAY CONTROL MODULE REFERENCE Item Windshield wiper switch (AUTO STOP/PARK) Hood switch (open) A/C pressure switch/thermal protector (A/C ON) COMBINATION SWITCH CONTROL UNIT COMBINATION SWITCH CONTROL UNIT REFERENCE 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) POWER WINDOW MASTER SWITCH (DOOR MULTIPLEX CONTROL UNIT) POWER WINDOW MASTER SWITCH REFERENCE 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) Driver's position memory switches (1, 2, memo) Passenger's power window switch Passenger's power window switch (UP) Passenger's power window switch (DOWN) (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 GAUGE CONTROL MODULE REFERENCE 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) MID switches (Select/Reset, < INFO, INFO >) POWER SEAT CONTROL UNIT POWER SEAT CONTROL UNIT REFERENCE 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 MIRROR CONTROL UNIT POWER MIRROR CONTROL UNIT REFERENCE Item Mirror select switch (LEFT, Center, RIGHT) Mirror switch (LEFT, RIGHT, UP, DOWN) MICU-REAR JUNCTION BOX MICU-REAR JUNCTION BOX REFERENCE Item Tailgate latch switch (Open) Tailgate lock knob switch (UNLOCK) Fuel fill door switch (Open) Left sliding door lock knob switch (UNLOCK) POWER TAILGATE CONTROL UNIT POWER TAILGATE CONTROL UNIT REFERENCE Item Driver's power tailgate switch (Open/Close) Power tailgate inner switch (Close) Power tailgate outer handle switch (Open) LEFT POWER SLIDING DOOR CONTROL UNIT LEFT POWER SLIDING DOOR CONTROL UNIT REFERENCE Item Left sliding door switch (Open) Left sliding door switch (Close) RIGHT POWER SLIDING DOOR CONTROL UNIT RIGHT POWER SLIDING DOOR CONTROL UNIT REFERENCE Item Right sliding door switch (Open) Right sliding door switch (Close) 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.

How to display DTCs on the gauge control module

While in Test Mode 1, the DTCs which have been detected and stored individually by various B-CAN (Body-controller Area Network) units, will be shown one by one on the multi-information display when the communication between the Multiplex Integrated Control Unit (MICU) and the gauge control module are normal. To scroll through the DTCs, press the select/reset switch on the gauge control module.

Scheme 18

The unit that has been stored the code can be identified by the number shown on the multi-information display.

CONTROL UNIT REFERENCE