Multiplex Integrated Control System: Other Honda Pilot II

Using the HDS (Preferred method)

Connect the HDS to the Data Link Connector (DLC).

Note. There are two ways to read B-CAN codes with HDS.

First method; Go to TROUBLESHOOTING - B-CAN SYSTEM DIAGNOSIS TEST MODE A to check for DTCs.

Second method; Ground the SCS circuit with the HDS, then read the DTCs displayed in the multi-information display in the gauge control module assembly, then go to TROUBLESHOOTING - B-CAN SYSTEM DIAGNOSIS TEST MODE A .

Without HDS (Use Only If the HDS Is Unavailable)

1. Check for communication circuit problems using B-CAN System Diagnostic Test Mode 1.
2. Check for DTCs.
3. If there are DTCs stored, sort them, and then troubleshoot the DTCs in this order: Battery voltage DTCs Internal error DTCs Loss of communication DTCs. NOTE: If the DTC U1280 is stored, troubleshoot DTC U1280 first. Refer to «LOSS OF COMMUNICATION CROSS REFERENCE TABLE»(ref-333611-S38963445352009072100000) . Signal error DTCs
4. If no DTCs are retrieved, use B-CAN System Diagnostic Test Mode 2 to check all inputs related to the failure (see step 9 on «TROUBLESHOOTING - B-CAN SYSTEM DIAGNOSIS TEST MODE 1 AND TEST MODE 2 (WITHOUT THE HDS)»(ref-333611-S14199629932009072100000) ).

Scheme 7

Scheme 8

1. Set the B-CAN System Diagnosis test Mode 1 (see «TROUBLESHOOTING - B-CAN SYSTEM DIAGNOSIS TEST MODE 1 AND TEST MODE 2 (WITHOUT THE HDS)»(ref-333611-S14199629932009072100000) ).
2. While in Test Mode 1, the DTCs which have been detected and stored individually by various B-CAN units, will be shown one by one on the multi-information display on the gauge control module when the communication between the MICU and the gauge control module is normal. To scroll through the DTCs, press the select/reset button. Information display type Multi-information display type
3. The unit that has stored the code can be identified by the number shown on the multi-information display. CONTROL UNIT REFERENCE TABLE Control Unit Control Unit I.D. Number MICU 10 Gauge control module 50 Door multiplex control unit (Power window master switch) 30 Immobilizer-keyless control unit 96 Climate control unit 51 HandsFreeLink control unit 94 Automatic lighting control unit 72 Parking and back-up sensor control unit 9A Power tailgate control unit 35 Power seat control unit 95

MICU

DTC TROUBLESHOOTING REFERENCE TABLE

Immobilizer-Keyless Control Unit

IMMOBILIZER-KEYLESS CONTROL UNIT REFERENCE TABLE

Door Multiplex Control Unit

DOOR MULTIPLEX CONTROL UNIT REFERENCE TABLE

HandsFreeLink Control Unit

HANDSFREELINK CONTROL UNIT REFERENCE TABLE

Gauge Control Module

GAUGE CONTROL MODULE REFERENCE TABLE

Climate Control Unit

CLIMATE CONTROL UNIT REFERENCE TABLE

HVAC Control Unit

HVAC CONTROL UNIT REFERENCE TABLE

Automatic Lighting Control Unit

AUTOMATIC LIGHTING CONTROL UNIT REFERENCE TABLE

Power Seat Control Unit

POWER SEAT CONTROL UNIT REFERENCE TABLE

Parking and Back-up Sensor Control Unit

PARKING AND BACK-UP SENSOR CONTROL UNIT REFERENCE TABLE

Power Tailgate Control Unit

POWER TAILGATE CONTROL UNIT REFERENCE TABLE

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 (125 kbps) for convenience related items and for other functions. F-CAN information moves at a faster speed (500 kbps) 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.

Scheme 9

Gateway Function

The gauge control module acts as a gateway 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.

Scheme 10

Network "Loss of Communication" Error Checking Function

The ECUs on the CAN circuit send messages to each other. If there are any malfunctions on the network, the LCD display on the gauge control module can indicate the error messages by entering the gauge control module self diagnostic function (see SELF-DIAGNOSTIC FUNCTION ).

Self-Diagnostic Function (On-Board Diagnosis)

By connecting the HDS to the data link connector (DLC), the HDS can retrieve the diagnostic information from the MICU via a diagnostic line called K-LINE. The K-LINE is separated from the CAN lines, and connected to the CAN related ECUs. The MICU is a gateway between the HDS and B-CAN related ECUs, and sends B-CAN diagnostic information to the HDS. When doing a function test with the HDS, the HDS sends an output signal through the K-LINE to the MICU. The MICU either relays the request to another ECU, or commands the function.

Scheme 11

Wake-Up and Sleep Function

The multiplex integrated control system has "wake-up" and "sleep" functions to decrease parasitic draw on the battery when the ignition switch is to LOCK (0).

1. In the sleep mode, the multiplex integrated control system stops functioning (communication and CPU control) when it is not necessary for the system to operate.
2. As soon as any operation is requested (for example, a door is unlocked), the related control units in the sleep mode immediately wake up and begin to function.
3. When the ignition switch is turned to LOCK (0), and the driver's door is opened, then closed, there is a delay about 40 seconds before the control unit goes from the wake-up mode to the sleep mode.
4. The sleep mode will not function if any door is opened or if the ignition switch is turned ON (II).
5. The draw is reduced from about 200 mA to less than 35 mA when in the sleep mode.

Note. See SLEEP AND WAKE-UP MODE TEST .

Fail-Safe Function

To prevent improper operation, the MICU have a fail-safe function. In the fail-safe mode, the output signal is fixed when any part of the system malfunctions (for example, a faulty control unit or communication line).

Each control unit has a hardware fail-safe function that fixes the output signal when there is a CPU malfunction, and a software fail-safe function that ignores the signal from a malfunctioning control unit, which allows the system to operate normally.

When a CPU problem or abnormal power supply voltage is detected, the MICU enters the hardware fail-safe mode, and each system output load is set to the pre-programmed fail-safe value.

Software Fail-Safe Control

When any of the data from the B-CAN circuit cannot be received within a specified time, or an unusual combination of the data is recognized, the MICU enters the software fail-safe mode. The data that cannot be received is forced to a pre-programmed value.

Power Supply Voltage Monitoring Function

The MICU monitors the power supply voltage (back-up voltage). If the voltage goes below 10 V, the MICU sends a MICU message and will not store DTCs.

INPUT AND OUTPUT REFERENCE TABLE

Entry Lights Control System (Individual Map Lights, Ignition Key Light)

The MICU controls the entry lights based upon the input signals from each switch and the B-CAN signals.

INPUT AND OUTPUT REFERENCE TABLE

Collision Detection Signal (CDS)

The MICU controls the door lock actuators based upon the IG1 and the SRS (CDS) signals.

INPUT AND OUTPUT REFERENCE TABLE

Key Interlock

The MICU controls the key interlock solenoid based upon the ignition switch ACC (I) position, the transmission range switch (P), and the park-pin switch signals.

INPUT AND OUTPUT REFERENCE TABLE

Headlight Auto-Off Function

The MICU controls the headlight auto-off function based upon the input signals from each switch and the B-CAN.

INPUT AND OUTPUT REFERENCE TABLE

Automatic Lighting System

The MICU controls the automatic lighting system based upon the input signals from each switch and the B-CAN.

INPUT AND OUTPUT REFERENCE TABLE

Headlights

The MICU controls the headlights based upon the input signals from each switch.

INPUT AND OUTPUT REFERENCE TABLE

Daytime Running Lights

The MICU controls the daytime running lights system based upon the input signals from each switch and the B-CAN data.

INPUT AND OUTPUT REFERENCE TABLE

Back-Up Lights

The MICU controls the back-up lights based upon the ignition switch (IG1) and the transmission range switch (R) signals.

INPUT AND OUTPUT REFERENCE TABLE

Turn Signal/Hazard Warning Lights

The MICU controls the turn signal/hazard warning lights based upon the input signals from the turn signal switch and the hazard warning switch.

INPUT AND OUTPUT REFERENCE TABLE

Fog Lights

The MICU controls the fog lights based upon the IG1, the combination light switch, and the fog light switch signals.

INPUT AND OUTPUT REFERENCE TABLE

Courtesy Light

The MICU controls the door courtesy lights based upon the input signals from the door switches.

INPUT AND OUTPUT REFERENCE TABLE

Cargo Area Light

The MICU controls the cargo area light based upon the hatch glass latch switch and the tailgate latch switch or the full latch switch signals.

INPUT AND OUTPUT REFERENCE TABLE

Power Door Locks

The MICU controls the door lock actuators based on inputs from each switch and B-CAN data.

INPUT AND OUTPUT REFERENCE TABLE

*: This system can be customized using the multi-information display (MID) to suit the customer's needs. For more information about customizing options, refer to the Owner's Manual.

Auto Door Lock

The MICU controls the door lock actuators based upon the input signals of each switch and the B-CAN data.

INPUT AND OUTPUT REFERENCE TABLE

*: This system can be customized using the multi-information display (MID) to suit the customer's needs. For more information about customizing options, refer to the Owner's Manual.

Auto Door Unlock

The MICU controls the door lock actuators based upon the input signals of each switch and the B-CAN data.

INPUT AND OUTPUT REFERENCE TABLE

*: This system can be customized using the multi-information display (MID) to suit the customer's needs. For more information about customizing options, refer to the Owner's Manual.

Keyless Entry System

The MICU controls the door lock actuators based upon the input signals of each switch and the B-CAN data.

INPUT AND OUTPUT REFERENCE TABLE

*: This system can be customized using the multi-information display (MID) to suit the customer's needs. For more information about customizing options, refer to the Owner's Manual.

Security Alarm System

The MICU controls the lighting system and horns based upon the input signals of each switch and the B-CAN signals.

INPUT AND OUTPUT REFERENCE TABLE

Prevention of Key Locked Inside Vehicle

The MICU controls the door lock actuators based on input from each switch and B-CAN data.

INPUT AND OUTPUT REFERENCE TABLE

HDS Inputs and Commands

Certain inputs happen so quickly that the HDS can not update fast enough. Hold the switch that is being tested while monitoring the Data List. This should give the HDS time to update the signal on the Data List. Because the HDS software is updated to support the release for newer vehicles it is not uncommon to see system function tests that are not supported. Make sure that the most current software is loaded.

Input

DATA LIST INDICATION TABLE

Troubleshooting - B-CAN System Diagnosis Test Mode A

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

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

Scheme 12

1. Compare the symptom 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 HandsFreeLink Horns (security and panic) Chimes (key-in, 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 Audio unit Immobilizer Parking and back-up sensor system 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 HDS to the data link connector (A), then turn the ignition switch to ON (II).
3. From the BODY ELECTRICAL menu, select UNIT INFORMATION, and then select CONNECTED UNIT listed to see if the following control units are communicating with the HDS. MICU Gauge control module Automatic lighting control unit Power seat control unit (HDS name: Memory seat control unit) HandsFreeLink control unit Door multiplex control unit (HDS name: Power window unit). Rear MICU Power tailgate control unit Climate control unit or HVAC control unit. Immobilizer-keyless control unit Parking and back-up sensor system NOTE: If a unit is communicating with the HDS, DETECT will be displayed. If a unit is not communicating or the vehicle is not equipped, "Not Available" will be displayed. Are all control units communicating with the HDS? YES - Go to step 4 . NO - If any of the control unit are not communicating, go to «TROUBLESHOOTING - B-CAN SYSTEM DIAGNOSIS TEST MODE B»(ref-333611-S24858931752009072100000) . If all units are not communicating or only the MICU is communicating, go to «DTC U1280: COMMUNICATION BUS LINE ERROR (BUS-OFF)»(ref-333611-S26701793972009072100000) .
4. Select the system that has the problem from BODY ELECTRICAL 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 «TROUBLESHOOTING - B-CAN SYSTEM DIAGNOSIS TEST MODE C»(ref-333611-S26109367652009072100000) , if the system does not stop or turn off. Go to Test Mode D (see «TROUBLESHOOTING - B-CAN SYSTEM DIAGNOSIS TEST MODE D»(ref-333611-S33201550422009072100000) ) if the system does not run or turn on. Exterior lights Turn signals Entry light control Interior lights Horns (security and panic) Power windows Wiper/washer Power door locks 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-in, seat belt and lights-on) Rear window defogger (climate control) Security Keyless entry Climate control Key interlock Dash lights brightness Audio system Navigation Driving position memory HandsFreeLink Power tailgate Immobilizer
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 DTC B1008 and B1011 are retrieved, troubleshoot DTC B1008 first). Refer to «LOSS OF COMMUNICATION DTC CROSS-REFERENCE TABLE»(ref-333611-S38963445352009072100000) . Signal error DTCs.

Troubleshooting - B-CAN System Diagnosis Test Mode B

Do 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 BODY ELECTRICAL.
2. Select DTCs, and then check for loss of communication DTCs. Refer to «LOSS OF COMMUNICATION DTC CROSS-REFERENCE TABLE»(ref-333611-S38963445352009072100000) . Are any loss of communication DTCs indicated? YES - Go to step 3 . NO - Replace the MICU.
3. Do the power, ground, and communication part of the input test for the unit not communicating with the HDS. UNIT COMMUNICATING REFERENCE TABLE Unit Not Communicating MICU (see «CONTROL UNIT INPUT TEST»(ref-333611-S30921808772009072100000) ) Gauge control module (see «GAUGE CONTROL MODULE INPUT TEST»(ref-333620-S28410140922009072100000) ) Automatic lighting control unit (see «AUTOMATIC LIGHTING CONTROL UNIT INPUT TEST/REPLACEMENT»(ref-333614-S03122929372009072100000) ) Door multiplex control unit (see «POWER WINDOW MASTER SWITCH INPUT TEST»(ref-333619-S33118904272009072100000) ) Power seat control unit (see «POWER SEAT CONTROL UNIT INPUT TEST/REPLACEMENT»(ref-333636-S23430400662009072100000) ) Parking and back-up sensor control unit (see «PARKING AND BACK-UP SENSOR CONTROL UNIT INPUT TEST/REPLACEMENT»(ref-333635-S29262428822009072100000) ) Power tailgate control unit (see «CONTROL UNIT INPUT TEST/REPLACEMENT»(ref-333637-S19205080542009072100000) ) HandsFreeLink control unit (see «HFL SYSTEM TROUBLESHOOTING»(ref-333643-S17375771212009072100000) ) Climate control unit troubleshooting () (see «CLIMATE CONTROL UNIT POWER, GROUND, AND COMMUNICATION CIRCUIT TROUBLESHOOTING»(ref-333598-S12142832712009072100000) ) HVAC control unit () (see «CLIMATE CONTROL UNIT POWER, GROUND, AND COMMUNICATION CIRCUIT TROUBLESHOOTING»(ref-333598-S12142832712009072100000) )

Troubleshooting - B-CAN System Diagnosis Test Mode C

Do 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 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 control the output devices (see SYSTEM DESCRIPTION ).

1. Check for DTCs by selecting the TEST MODE menu from the HDS. Are any DTCs indicated? YES - Go to «TROUBLESHOOTING - B-CAN SYSTEM DIAGNOSIS TEST MODE A»(ref-333611-S24721524652009072100000) . • 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 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.
5. Check the relay if applicable, 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. Check the switch, then check for a short in the wire between the switch and the control unit that monitors the switch.

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

Do 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 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 control the output devices (see SYSTEM DESCRIPTION ).

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 «TROUBLESHOOTING - B-CAN SYSTEM DIAGNOSIS TEST MODE A»(ref-333611-S24721524652009072100000) . • 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. Do 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 - 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 indicate 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.

Are 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.