Multiplex Integrated Control System Acura MDX II

Scheme 1

Troubleshooting CAN Circuit Related Problems

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

Using the HDS (Preferred method)

1. Go to «B-CAN SYSTEM DIAGNOSIS TEST MODE A»(/acura/mdx/ii-2006-2010/remont/communication-devices/#multiplex-integrated-control-system__troubleshooting-b-can-system-diagnosis-test) to check for "Connected units" and DTCs .
2. If no DTCs are retrieved, go to «B-CAN SYSTEM DIAGNOSIS TEST MODE C»(/acura/mdx/ii-2006-2010/remont/communication-devices/#multiplex-integrated-control-system__troubleshooting-b-can-system-diagnosis-test) or «TROUBLESHOOTING - B-CAN SYSTEM DIAGNOSIS TEST MODE D»(/acura/mdx/ii-2006-2010/remont/communication-devices/#multiplex-integrated-control-system__troubleshooting-b-can-system-diagnosis-test) .

Without HDS (Use only if the HDS is unavailable)

1. Check for communication circuit problems using B-CAN System Diagnostic Test (see «TROUBLESHOOTING - B-CAN SYSTEM DIAGNOSIS TEST MODE A»(/acura/mdx/ii-2006-2010/remont/communication-devices/#multiplex-integrated-control-system__troubleshooting-b-can-system-diagnosis-test) ).
2. Check for DTCs.
3. Sort, and then troubleshoot the DTCs in this order: Battery voltage DTCs Internal error DTCs Loss of communication DTCs (beginning with the lowest number first; for example, if B1008 and B1011 are retrieved, troubleshoot B1008 first). Refer to loss of communication cross reference chart. 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 10 on «TROUBLESHOOTING - B-CAN SYSTEM DIAGNOSIS TEST MODE 1 AND TEST MODE 2 (WITHOUT THE HDS)»(/acura/mdx/ii-2006-2010/remont/communication-devices/#multiplex-integrated-control-system__troubleshooting-b-can-system-diagnosis-test) ).

Scheme 2

1. Set the multiplex in Test Mode 1 (see «TEST MODE 1»(/acura/mdx/ii-2006-2010/remont/communication-devices/#multiplex-integrated-control-system__test-mode-1) ).
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.
3. The unit that has stored the code can be identified by the number shown on the multi-information display (MID). MULTI-INFORMATION DISPLAY (MID) CODE REFERENCE Unit Code (Control Unit I.D. Number) MICU 10 Relay control module 11 Rear MICU 12 Power tailgate control unit 31 Driver's MPCS unit 35 Gauge control module 50 Climate control unit 51 Combination switch control unit 70 HandsFreeLink control unit 94 Power seat control unit 95 Immobilizer-keyless control unit 96 AcuraLink control unit (XM receiver) 97

How to clear the DTC

While in DTC indication status, press and hold down the select/reset button for more than 10 seconds.

Loss of Communication DTC cross-reference chart

When an electronic control unit (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.
2. Do the input test for the transmitting control unit.

BUS OFF and Internal Error Codes

BUS OFF AND INTERNAL ERROR CODES REFERENCE

BUS OFF AND INTERNAL ERROR CODES REFERENCE

DTC Troubleshooting Index

Note. Record all DTCs, and sort them by DTC type using the DTC troubleshooting index, then troubleshoot the DTC(s) in this order: Battery voltage DTCs Internal error DTCs Loss of communication DTCs (beginning with the lowest number first; for example, if B1005 and B1016 are retrieved, troubleshoot B1005 first). Signal error DTCs

MICU

DTC TROUBLESHOOTING CHART

Relay Control Module

RELAY CONTROL MODULE - DTC TROUBLESHOOTING CHART

Gauge Control Module

GAUGE CONTROL MODULE - DTC TROUBLESHOOTING CHART

Climate Control Unit

CLIMATE CONTROL UNIT - DTC TROUBLESHOOTING CHART

Climate Control Unit

CLIMATE CONTROL UNIT - DTC TROUBLESHOOTING CHART

Combination Switch Control Unit

COMBINATION SWITCH CONTROL UNIT - DTC TROUBLESHOOTING CHART

Power Tailgate Control Unit

POWER TAILGATE CONTROL UNIT - DTC TROUBLESHOOTING CHART

Hands Free Link Control Unit

HANDS FREE LINK CONTROL UNIT - DTC TROUBLESHOOTING CHART

Immobilizer-Keyless Control Unit

IMMOBILIZER-KEYLESS CONTROL UNIT - DTC TROUBLESHOOTING CHART

Rear MICU

REAR MICU - DTC TROUBLESHOOTING CHART

Power Seat Control Unit

POWER SEAT CONTROL UNIT - DTC TROUBLESHOOTING CHART

Driver's MPCS Unit

DRIVER'S MPCS UNIT - DTC TROUBLESHOOTING CHART

AcuraLink Control Unit

AcuraLink Control Unit - DTC TROUBLESHOOTING CHART

MICU Control Functions

The MICU (built into the under-dash fuse/relay box) is one of the B-CAN system components. The MICU controls many systems related to the body controller area and security system, and also works as a gateway to diagnose the other B-CAN connected ECUs with the HDS.

The MICU also controls the function of these circuits

Refer to each system circuit diagram for details.

1. Entry lights control (individual map lights and ceiling light)
2. Exterior lights control (including the daytime running lights control and back-up lights)
3. Interlock system
4. Keyless entry
5. Power door locks
6. Security alarm
7. Turn signal/hazard warning lights
8. Tailgate actuator
9. Automatic lighting
10. Impact sensing door lock release
11. Door mirror switch
12. IMOCD(S-NET)

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 (33.33 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 3

1. The single wire method is used between the units not requiring the communication to move at a fast speed.
2. Using a single wire method reduces the number of the wires used on the body controller area network.

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 4

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 odo/trip display on the gauge control module can indicate the error messages by entering the gauge self-diagnostic function (see SELF-DIAGNOSTIC FUNCTION ). There are three types of messages as follows

Error Code List

ERROR CODE LIST

Scheme 5

Self-diagnostic Function

By connecting the HDS to the data link connector (DLC), the HDS can retrieve the diagnostic results from the MICU via a diagnostic BUS called the K-LINE. The K-LINE is different from the CAN line, 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 results to the HDS. When performing 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 itself.

Scheme 6

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 in LOCK (0) position.

1. In the sleep mode, the MICU 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 unit in the sleep mode immediately wakes up and begins 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 2.6 A to less than 35 mA when in the sleep mode.

Note. Sleep and Wake-up Mode Test (see SLEEP AND WAKE-UP MODE TEST ).

Fail-safe Function

To prevent improper operation, the MICU has 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 a abnormal power supply voltage is detected, the MICU moves to 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 moves to 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 an MICU message and will not store DTCs.

POWER SUPPLY VOLTAGE MONITORING FUNCTION INPUT AND OUTPUT REFERENCE

Entry Lights Control System (Ceiling Lights, Ignition Key Light)

The MICU controls the ceiling light and ignition key light ON/OFF based upon the input signals from each switch.

ENTRY LIGHTS CONTROL SYSTEM INPUT AND OUTPUT REFERENCE

Back-up Lights

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

BACK-UP LIGHTS INPUT AND OUTPUT REFERENCE

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.

TURN SIGNAL/HAZARD WARNING LIGHTS INPUT AND OUTPUT REFERENCE

Collision Detection Signal (CDS)

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

COLLISION DETECTION SIGNAL (CDS) INPUT AND OUTPUT REFERENCE

Automatic Lighting System

The MICU controls the automatic lighting system based upon the IG1, IG2, automatic lighting sensor signals, and B-CAN signals.

AUTOMATIC LIGHTING SYSTEM INPUT AND OUTPUT REFERENCE

Headlight Washer Operation

The MICU controls the headlight washer system based upon the headlight switch and washer switch signals.

HEADLIGHT WASHER OPERATION INPUT AND OUTPUT REFERENCE

Key Interlock

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

KEY INTERLOCK INPUT AND OUTPUT REFERENCE

Power Door Locks (Unlock all doors and tailgate at the same time)

The MICU controls the door lock actuators based upon the input signals of each switch.

POWER DOOR LOCKS INPUT AND OUTPUT REFERENCE

Power Door Locks (Unlock only the driver's door first)

The MICU controls the door lock actuators based upon the input signals of each switch.

POWER DOOR LOCKS INPUT AND OUTPUT REFERENCE

Door Lock Response Operation

The MICU controls the door lock actuators based upon the B-CAN signals.

DOOR LOCK RESPONSE OPERATION INPUT AND OUTPUT REFERENCE

Keyless Entry System (Unlock all doors and tailgate at the same time)

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

KEYLESS ENTRY SYSTEM INPUT AND OUTPUT REFERENCE

Keyless Entry System (Unlock only the driver's door first)

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

KEYLESS ENTRY SYSTEM INPUT AND OUTPUT REFERENCE

Answer Back Response Operation

The MICU controls the turn signal lights based upon the B-CAN signals.

ANSWER BACK RESPONSE OPERATION INPUT AND OUTPUT REFERENCE

Auto Power Door Locks (LOCK operation)

The MICU controls the door lock actuators based upon the input signals of each switch.

AUTO POWER DOOR LOCKS INPUT AND OUTPUT REFERENCE

Auto Power Door Locks (UNLOCK operation)

The MICU controls the door lock actuators based upon the input signals of each switch.

AUTO POWER DOOR LOCKS INPUT AND OUTPUT REFERENCE

Tailgate Outer Handle Switch Operation (Unlock all doors and tailgate at the same time)

The MICU controls the tailgate release actuator based upon the tailgate outer handle switch and the B-CAN signals.

TAILGATE OUTER HANDLE SWITCH OPERATION INPUT AND OUTPUT REFERENCE

Tailgate Outer Handle Switch Operation (Unlock only the driver's door first)

The MICU controls the tailgate release actuator based upon the tailgate outer handle switch and the B-CAN signals.

TAILGATE OUTER HANDLE SWITCH OPERATION INPUT AND OUTPUT REFERENCE

Security Alarm System

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

SECURITY ALARM SYSTEM INPUT AND OUTPUT REFERENCE

Prevention of Key Locked Inside Vehicle

The MICU controls the door lock actuators based upon the input signals of each switch.

PREVENTION OF KEY LOCKED INSIDE VEHICLE INPUT AND OUTPUT REFERENCE

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

HDS INPUT REFERENCE

Input

HDS INPUT REFERENCE

Input

HDS INPUT REFERENCE

Input

HDS INPUT REFERENCE

Input

HDS INPUT REFERENCE

Input

HDS INPUT REFERENCE

Output

HDS OUTPUT REFERENCE

Output

HDS OUTPUT REFERENCE

Troubleshooting - B-CAN System Diagnosis Test Mode A

Check the PCM for DTCs and troubleshooting 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.

Perform this diagnosis first 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 .

Scheme 7

1. Check the symptom against 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 XM radio Immobilizer 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, then turn the ignition switch ON (II).
3. From the BODY ELECTRICAL system select menu, select UNIT INFORMATION, and then select CONNECTED UNIT listed to see if it is communicating with the HDS. MICU Gauge control module Combination switch control unit Relay control module Power seat control unit HandsFreeLink control unit Driver's MPCS unit Rear MICU AcuraLink control unit (XM receiver) Power tailgate control unit Climate control unit Immobilizer-keyless control unit NOTE: If the unit is communicating with the HDS, DETECT will be displayed. If the unit is not communicating, "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 «B-CAN System Diagnosis Test Mode B»(/acura/mdx/ii-2006-2010/remont/communication-devices/#multiplex-integrated-control-system__troubleshooting-b-can-system-diagnosis-test) (see ). If all units are not communicating or only the MICU is communicating, go to «DTC B1000 troubleshooting»(/acura/mdx/ii-2006-2010/remont/communication-devices/#multiplex-integrated-control-system) .
4. Select the system that has the problem from BODY ELECTRICAL system select 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»(/acura/mdx/ii-2006-2010/remont/communication-devices/#multiplex-integrated-control-system__troubleshooting-b-can-system-diagnosis-test) , if the system does not stop or turn off. Go to «Troubleshooting - B-CAN System Diagnosis Test Mode D»(/acura/mdx/ii-2006-2010/remont/communication-devices/#multiplex-integrated-control-system__troubleshooting-b-can-system-diagnosis-test) 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, begin by troubleshooting B1008). Refer to loss of communication DTC cross reference chart (see «LOSS OF COMMUNICATION DTC CROSS-REFERENCE CHART»(/acura/mdx/ii-2006-2010/remont/communication-devices/#multiplex-integrated-control-system__loss-of-communication-dtc-cross-reference-chart) ). 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 BODY ELECTRICAL.
2. Select DTCs, and then check for loss of communication DTCs. Refer to loss of communication DTC cross reference chart. 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 Rear MICU loss of communication DTCs before troubleshooting AcuraLink control unit (XM receiver) the power tailgate control unit, and the power seat control unit DTC. UNIT NOT COMMUNICATING - INPUT TEST REFERENCE Unit not communicating MICU (see «MICU INPUT TEST»(/acura/mdx/ii-2006-2010/remont/communication-devices/#multiplex-integrated-control-system__micu-input-test) ) Gauge control module (see «GAUGE CONTROL MODULE INPUT TEST»(/acura/mdx/ii-2006-2010/remont/gauges-instrument-panels/#gauges__gauge-control-module-input-test) ) Relay control module (see «RELAY CONTROL MODULE INPUT TEST»(/acura/mdx/ii-2006-2010/remont/communication-devices/#multiplex-integrated-control-system__relay-control-module-input-test) ) Driver's MPCS unit (see «DRIVER'S MPCS UNIT INPUT TEST»(/acura/mdx/ii-2006-2010/remont/windows/#power-windows) ) Combination switch control unit (see «WIPER/WASHER SWITCH (COMBINATION SWITCH CONTROL UNIT) INPUT TEST»(/acura/mdx/ii-2006-2010/remont/wiperwasher-systems/#wiper-system-washer-system__wiperwasher-switch-combination-switch-control-unit) ) Immobilizer-keyless control unit (see «IMMOBILIZER-KEYLESS CONTROL UNIT INPUT TEST»(/acura/mdx/ii-2006-2010/remont/door-locks-anti-theft-systems/#immobilizer-system__immobilizer-keyless-control-unit-input-test) ) Rear MICU (see «REAR MICU INPUT TEST»(/acura/mdx/ii-2006-2010/remont/communication-devices/#multiplex-integrated-control-system__rear-micu-input-test) ) Power seat control unit (see «POWER SEAT CONTROL UNIT INPUT TEST»(/acura/mdx/ii-2006-2010/remont/memory-modules/#driver-position-memory-system-dpms__power-seat-control-unit-input-test) ) Power tailgate control unit (see «CONTROL UNIT INPUT TEST/REPLACEMENT»(/acura/mdx/ii-2006-2010/remont/exterior-body-panels/#power-tailgate__control-unit-input-testreplacement) ) Climate control unit troubleshooting (see «CLIMATE CONTROL UNIT TROUBLESHOOTING»(/acura/mdx/ii-2006-2010/remont/automatic-hvac-system/#climate-control-system) )

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 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 SYSTEM DESCRIPTION ). Always turn the ignition switch within 3 seconds when prompted in the DTC troubleshooting procedures .

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»(/acura/mdx/ii-2006-2010/remont/communication-devices/#multiplex-integrated-control-system__troubleshooting-b-can-system-diagnosis-test) (see ). 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. 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 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 SYSTEM DESCRIPTION ). Always turn the ignition switch within 3 seconds when prompted in the DTC troubleshooting procedures .

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»(/acura/mdx/ii-2006-2010/remont/communication-devices/#multiplex-integrated-control-system__troubleshooting-b-can-system-diagnosis-test) . 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 0V 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.

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

Scheme 8

1. Check the No. 7 (10 A) and No. 21 (7.5 A) fuses in the 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»(/acura/mdx/ii-2006-2010/remont/exteriorinterior-trim/#interior-trim__trim-removalinstallation-door-areas) ).
3. Turn the ignition switch ON (II), and move the ceiling light switch to the middle (door) position.
4. Connect the MPCS service connector (A) to the MCIC socket (B) in the under-dash fuse/relay box.
5. Wait 5 seconds, and watch the ceiling lights. When the ceiling lights flash quickly once, and then go off, the system is in Test Mode 1.
6. Check for B-CAN DTCs indicated by the gauge control module LCD display while still in Test Mode 1. Push the odometer select/reset button to display the next code. After you get to the last code, the display shows END. If no DTCs are stored, the display will read NO. Are any DTCs indicated? YES - Go to Step 7. NO - Go to Step 10 .
7. Record all DTCs and sort them.
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 B1008 and B1011 are retrieved, troubleshoot B1008 first). Refer to less of communication DTC cross reference chart (see «LOSS OF COMMUNICATION DTC CROSS-REFERENCE CHART»(/acura/mdx/ii-2006-2010/remont/communication-devices/#multiplex-integrated-control-system__loss-of-communication-dtc-cross-reference-chart) ). Signal error DTCs
9. Clear the DTCs by pressing and holding the select/ reset button for about 10 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 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 ceiling light will flash two times quickly and then go off. NOTE: If the MPCS 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 ceiling lights will blink once. If the circuit is faulty, there will be no indication.

MICU

MICU REFERENCE

RELAY CONTROL MODULE

RELAY CONTROL MODULE REFERENCE

COMBINATION SWITCH CONTROL UNIT

COMBINATION SWITCH CONTROL UNIT REFERENCE

REAR MICU

REAR MICU REFERENCE

DRIVER'S MPCS UNIT

DRIVER'S MPCS UNIT REFERENCE

GAUGE CONTROL MODULE

GAUGE CONTROL MODULE REFERENCE

POWER SEAT CONTROL UNIT

POWER SEAT CONTROL UNIT REFERENCE

FRONT PASSENGER'S MPCS UNIT

FRONT PASSENGER'S MPCS UNIT REFERENCE

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.

Sleep and Wake-up Mode Test

1. Shift to the sleep mode: Turn the ignition switch to LOCK (0), and close the driver's door. If the MICU receives no signals from the inputs listed below, it will go into sleep mode in less than 40 seconds. Driver's door lock switch (LOCK or UNLOCK) Driver's door key cylinder switch (LOCK or UNLOCK) Front passenger's door lock switch (LOCK or UNLOCK) Tailgate latch switch (Tailgate closed) Hazard warning switch (OFF) Power tailgate outer handle switch Power tailgate inside switch Power tailgate opener switch
2. Confirm the sleep mode: Measure the frequency on the B-CAN communication line (LT GRN wires); there should be 0 Hz in the sleep mode. Check the parasitic draw at the battery while shifting into the sleep mode; amperage should change from about 2.6 A to less than 35 mA.
3. Shift to the wake up mode: When the ignition switch is turned ON (II), the MICU, and all B-CAN system components wake up. When any switch in the multiplex integrated control system is turned on, a message is sent to the related control unit(s) to command the desired function. After confirming the sleep mode, look in the following table for the switch most related to the problem. Operate that switch and see if its control unit wakes up. NOTE: If any control unit is faulty and will not wake up, several circuits in the system will malfunction at the same time. In the table below, the control unit is followed by a list of the switches and input signals that can wake it up. Door switches (door open) Driver's door lock switch (LOCK or UNLOCK) Driver's door lock knob switch (LOCK or UNLOCK) Driver's door key cylinder switch (LOCK or UNLOCK) Front passenger's door lock switch (LOCK or UNLOCK) Front passenger's door lock knob switch (LOCK or UNLOCK) Left rear door lock knob switch Right rear door lock knob switch Tailgate latch switch (Tailgate open) Hood switch (hood open) Hazard warning switch (ON) Combination light switch (Parking, Headlight, Dimmer, Passing ON) Ignition key switch (key inserted)

Scheme 9

Scheme 10

Scheme 11

Scheme 12

1. Clear the DTCs with the HDS.
2. Turn the ignition switch to LOCK (0), and then back ON (II).
3. Wait for 6 seconds or more.
4. Check for DTCs with the HDS. Is DTC B1000 indicated? YES - Go to step 5. NO - Intermittent failure, the communication bus line is OK at this time. Check for loose or poor connections, or worn/shorted wires. If the connections are good, check the battery condition (see «BATTERY TEST»(/acura/mdx/ii-2006-2010/remont/body-electrical/#battery) ) and the charging system.
5. Check for DTCs with the HDS. Are DTCs B1000, B1005, B1007, B1011, B1012, B1013, B1015 and B1032 all indicated? YES - Go to step 6. NO - Faulty MICU; replace the under-dash fuse/ relay box.
6. Turn the ignition switch to LOCK (0).
7. Disconnect the appropriate connector at each control unit in the table one at a time. Clear the DTC, then recheck for DTCs after each unit is disconnected. CONTROL UNIT CONNECTOR REFERENCE Control unit Connector Relay control module Under-hood fuse/relay box connector E (14P) Gauge control module Connector A (12P) Immobilizer-keyless control unit 7P connector Combination switch control unit 8P connector Driver's MPCS unit Connector A (40P) Climate control unit 40P connector Audio unit Connector C (24P) HandsFreeLink control unit 28P connector Power seat control unit Connector A (40P) Power tailgate control unit Connector C(14P) AcuraLink control unit (XM receiver) Connector B(16P) Rear MICU (1) Rear fuse/relay box connector B (34P) (1) Disconnect this one last Is DTC B1000 indicated with each individual unit disconnected? YES - Go to step 11 . NO - Replace the control unit that was disconnected when B1000 did not reset (If the unit is the rear MICU, go to step 8.)
8. Disconnect rear fuse/relay box connectors B (34P) and C (42P).
9. Check for continuity between each of the rear fuse/ relay box connector terminals listed in the table and body ground. REAR FUSE/ RELAY BOX CONNECTOR TERMINALS REFERENCE Connected control unit Rear fuse/relay box connector terminal Power seat control unit B14 Power tailgate control unit C16 AcuraLink control unit (XM receiver) C32 Is there continuity? YES - Repair short to ground in the wire between the rear fuse/relay box and the affected control unit. NO - Go to step 10.
10. Measure the voltage between each of the rear fuse/ relay box connector terminals listed in the table and body ground. REAR FUSE/ RELAY BOX CONNECTOR TERMINALS REFERENCE Connected control unit Rear fuse/relay box connector terminal Power seat control unit B14 Power tailgate control unit C16 Acura Link control unit (XM receiver) C32 Is there less than 1 V? YES - Replace the rear fuse/relay box. NO - Repair short to power in the wire between the rear fuse/ relay box and the affected control unit.
11. Disconnect each control unit connectors in the table. CONTROL UNIT CONNECTOR REFERENCE Control unit Connector Relay control module Under-hood fuse/relay box connector E (14P) Gauge control module Connector A (12P) Immobilizer-keyless control unit 7P connector Combination switch control unit 8P connector Driver's MPCS unit Connector A (40P) Climate control unit 40P connector Audio unit Connector C (24P) HandsFreeLink control unit 28P connector
12. Check for continuity between the under-dash fuse/ relay box connector N (45P) No. 22 terminal and body ground. Is there continuity? YES - Repair short to ground in the wire. NO - Go to step 13.
13. Turn the ignition switch ON (II).
14. Measure the voltage between the under-dash fuse/ relay box connector N (45P) No. 22 terminal and body ground. Is there battery voltage? YES - Repair short to power in the wire. NO - Faulty MICU, replace the under-dash fuse/ relay box.

DTC B1001: MICU Internal (CPU) Error; DTC B1002: MICU Internal (EEPROM) Error

Note. If you are troubleshooting multiple DTCs, be sure to follow the instructions in B-CAN System Diagnosis Test Mode A (see TROUBLESHOOTING - B-CAN SYSTEM DIAGNOSIS TEST MODE A ).

1. Clear the DTCs with the HDS.
2. Turn the ignition switch to LOCK (0), and then back ON (II).
3. Wait for 6 seconds or more.
4. Check for DTCs with the HDS. Is DTC B1001 and/or B1002 indicated? YES - Faulty MICU, replace the under-dash fuse/ relay box. NO - Intermittent failure, the system is OK at this time.

DTC B1005: MICU Lost Communication with Relay Control Module (RM Message)

Note. If you are troubleshooting multiple DTCs, be sure to follow the instructions in B-CAN System Diagnosis Test Mode A (see TROUBLESHOOTING - B-CAN SYSTEM DIAGNOSIS TEST MODE A ).

1. Clear the DTCs with the HDS.
2. Turn the ignition switch to LOCK (0), and then back ON (II).
3. Wait for 6 seconds or more.
4. Check for DTCs with the HDS. Is DTC B1005 indicated? YES - Go to step 5. NO - Intermittent failure, the system is OK at this time. Check for loose or poor connections between the MICU and the relay control module.
5. Check for DTCs with the HDS. Are DTCs B1158, B1959, B2162, and B2970 also indicated with B1005? YES - Do the relay control module input test (see «RELAY CONTROL MODULE INPUT TEST»(/acura/mdx/ii-2006-2010/remont/communication-devices/#multiplex-integrated-control-system__relay-control-module-input-test) ). NO - Do the MICU input test (see «MICU INPUT TEST»(/acura/mdx/ii-2006-2010/remont/communication-devices/#multiplex-integrated-control-system__micu-input-test) ).

DTC B1007: MICU Lost Communication with Combination Switch Control Unit (HLSW Message)

Note. If you are troubleshooting multiple DTCs, be sure to follow the instructions in B-CAN System Diagnosis Test Mode A (see TROUBLESHOOTING - B-CAN SYSTEM DIAGNOSIS TEST MODE A ).

1. Clear the DTCs with the HDS.
2. Turn the ignition switch to LOCK (0), and then back ON (II).
3. Wait for 6 seconds or more.
4. Check for DTCs with the HDS. Is DTC B1007 indicated? YES - Go to step 5. NO - Intermittent failure, the system is OK at this time. Check for loose or poor connections between the MICU and the combination switch control unit.
5. Check for DTCs with the HDS. Are DTCs B1062, B1155, and B1957 also indicated with DTC B1007? YES - Do the combination switch control unit input test (see «WIPER/WASHER SWITCH (COMBINATION SWITCH CONTROL UNIT) INPUT TEST»(/acura/mdx/ii-2006-2010/remont/wiperwasher-systems/#wiper-system-washer-system__wiperwasher-switch-combination-switch-control-unit) ). NO - Do the MICU input test (see «MICU INPUT TEST»(/acura/mdx/ii-2006-2010/remont/communication-devices/#multiplex-integrated-control-system__micu-input-test) ).

DTC B1011: MICU Lost Communication with Gauge Control Module (VSP/NE Message)

Note. If you are troubleshooting multiple DTCs, be sure to follow the instructions in B-CAN System Diagnosis Test Mode A (see TROUBLESHOOTING - B-CAN SYSTEM DIAGNOSIS TEST MODE A ).

1. Clear the DTCs with the HDS.
2. Turn the ignition switch to LOCK (0), and then back ON (II).
3. Wait for 6 seconds or more.
4. Check for DTCs with the HDS. Is DTC B1011 indicated? YES - Go to step 5. NO - Intermittent failure, the system is OK at this time. Check for loose or poor connections between the MICU and the gauge control module.
5. Check for DTCs with the HDS. Are DTCs B1060, B1205, B1357, B1408, B1805, and/or B2160 also indicated with DTC B1011? YES - Do the gauge control module input test (see «GAUGE CONTROL MODULE INPUT TEST»(/acura/mdx/ii-2006-2010/remont/gauges-instrument-panels/#gauges__gauge-control-module-input-test) ). NO - Do the MICU input test (see «MICU INPUT TEST»(/acura/mdx/ii-2006-2010/remont/communication-devices/#multiplex-integrated-control-system__micu-input-test) ).

DTC B1012: MICU Lost Communication with Rear MICU (RJC Message)

Note. If you are troubleshooting multiple DTCs, be sure to follow the instructions in B-CAN System Diagnosis Test Mode A (see TROUBLESHOOTING - B-CAN SYSTEM DIAGNOSIS TEST MODE A ).

1. Clear the DTCs with the HDS.
2. Turn the ignition switch to LOCK (0), and then back ON (II).
3. Wait for 6 seconds or more.
4. Check for DTCs with the HDS. Is DTC B1012 indicated? YES - Go to step 5. NO - Intermittent failure, the system is OK at this time. Check for loose or poor connections between the MICU and the rear MICU.
5. Check for DTCs with the HDS. Is DTC B1955 indicated with DTC B1012? YES - Do the rear MICU input test (see «REAR MICU INPUT TEST»(/acura/mdx/ii-2006-2010/remont/communication-devices/#multiplex-integrated-control-system__rear-micu-input-test) ). NO - Do the MICU input test (see «MICU INPUT TEST»(/acura/mdx/ii-2006-2010/remont/communication-devices/#multiplex-integrated-control-system__micu-input-test) ).

DTC B1013: MICU Lost Communication with Driver's MPCS Unit (ASLOCKSW Message); DTC B1015: MICU Lost Communication with Driver's MPCS Unit (DRLOCKSW Message)

Note. If you are troubleshooting multiple DTCs, be sure to follow the instructions in B-CAN System Diagnosis Test Mode A (see TROUBLESHOOTING - B-CAN SYSTEM DIAGNOSIS TEST MODE A ).

1. Clear the DTCs with the HDS.
2. Turn the ignition switch to LOCK (0), and then back ON (II).
3. Wait for 6 seconds or more.
4. Check for DTCs with the HDS. Is DTC B1013 and/or B1015 indicated? YES - Go to step 5. NO - Intermittent failure, the system is OK at this time. Check for loose or poor connections between the MICU and the driver's MPCS unit.
5. Check for DTCs with the HDS. Are DTCs B1065, B1082, B1356, B1358, and/or B1905 also indicated with B1013 and/or B1015? YES - Do the driver's MPCS unit input test (see «DRIVER'S MPCS UNIT INPUT TEST»(/acura/mdx/ii-2006-2010/remont/windows/#power-windows) ). NO - Do the MICU input test (see «MICU INPUT TEST»(/acura/mdx/ii-2006-2010/remont/communication-devices/#multiplex-integrated-control-system__micu-input-test) ).

DTC B1032: MICU Lost Communication with the SRS Unit (CDS Message)

Note. If you are troubleshooting multiple DTCs, be sure to follow the instructions in B-CAN System Diagnosis Test Mode A (see TROUBLESHOOTING - B-CAN SYSTEM DIAGNOSIS TEST MODE A ).

1. Clear the DTCs with the HDS.
2. Turn the ignition switch to LOCK (0), and then back ON (II).
3. Wait for 6 seconds or more.
4. Check for DTCs with the HDS. Is DTC B1032 indicated? YES - Go to step 5. NO - Intermittent failure, the system is OK at this time. Check for loose or poor connections.
5. Check for DTCs with the HDS. Is DTC B1011 also indicated with DTC B1032? YES - Check for an open in the wire between the MICU and the gauge control module. If the circuit is bad, repair the open. NO - Do the gauge control module input test (see «GAUGE CONTROL MODULE INPUT TEST»(/acura/mdx/ii-2006-2010/remont/gauges-instrument-panels/#gauges__gauge-control-module-input-test) ).

DTC B1080: Ignition Key Switch Circuit Malfunction

Note. If you are troubleshooting multiple DTCs, be sure to follow the instructions in B-CAN System Diagnosis Test Mode A (see TROUBLESHOOTING - B-CAN SYSTEM DIAGNOSIS TEST MODE A ).

Scheme 13

Scheme 14

Scheme 15

Scheme 16

1. Clear the DTCs with the HDS.
2. Turn the ignition switch to LOCK (0), and then back ON (II).
3. Wait for 6 seconds or more.
4. Check for DTCs with the HDS. Is DTC B1080 indicated? YES - Go to step 5. NO - Intermittent failure, the system is OK at this time. Check for loose or poor connections.
5. Turn the ignition switch to LOCK (0).
6. Disconnect under-hood fuse/relay box connector D (10P).
7. Turn the ignition switch ON (II).
8. Measure the voltage between the under-hood fuse/ relay box connector D (10P) No. 7 terminal and body ground. Is there battery voltage? YES - Substitute a known-good under-hood fuse/ relay box and recheck. NO - Go to step 9.
9. Turn the ignition switch to LOCK (0).
10. Check for continuity between the under-hood fuse/ relay box connector D (10P) No. 7 terminal and body ground. Is there continuity? YES - Repair a short to ground in the wire. After repairing, replace the No. 21 (7.5 A) fuse in the under-dash fuse/relay box. NO - Go to step 11.
11. Disconnect under-dash fuse/relay box connector D (17P).
12. Connect the under-dash fuse/relay box connector D (17P) No. 6 terminal and body ground with a jumper wire.
13. Check for continuity between the under-hood fuse/ relay box connector D (10P) No. 7 terminal and body ground. Is there continuity? YES - Substitute a known-good under-dash fuse/ relay box and recheck. NO - Repair open in the wire.

DTC B1050: Communication Bus Line Error; DTC B1150: Communication Bus Line Error; DTC B1200: Communication Bus Line Error; DTC B1250: Communication Bus Line Error; DTC B1350: Communication Bus Line Error; DTC B1750: Communication Bus Line Error; DTC B1800: Communication Bus Line Error; DTC B1900: Communication Bus Line Error; DTC B1950: Communication Bus Line Error; DTC B2150: Communication Bus Line Error; DTC B2200: Communication Bus Line Error

Note. If you are troubleshooting multiple DTCs, be sure to follow the instructions in B-CAN System Diagnosis Test Mode A (see TROUBLESHOOTING - B-CAN SYSTEM DIAGNOSIS TEST MODE A ).

1. Clear the DTCs with the HDS.
2. Turn the ignition switch to LOCK (0), and then back ON (II).
3. Wait for 6 seconds or more.
4. Check for DTCs with the HDS. Are DTCs B1050, B1150, B1200, B1250, B1350, B1750, B1800, B1900, B1950, B2150, and/or B2200 indicated? YES - Go to step 5. NO - Intermittent failure, the system is OK at this time. Check for loose or poor connections at the MICU and B-CAN connected units in the table.
5. Check for DTCs with the HDS. UNDER-DASH FUSE/ RELAY BOX CONNECTOR REFERENCE Under-dash fuse/ relay box connector B-CAN connected unit connector Connector D(17P) No. 11 terminal Under-hood fuse/relay box connector E (14P) No. 1 terminal Connector N (45P) No. 22 terminal Gauge control module connector A (12P) No. 5 terminal Connector N (45P) No. 28 terminal Combination switch control unit 8P connector No. 4 terminal Connector J (21P) No. 4 terminal Driver's MPCS unit connector A (40P) No. 28 terminal Connector X (39P) No. 27 terminal Immobilizer-keyless control unit 7P connector No. 4 terminal Connector X (39P) No. 27 terminal Climate control unit 40P connector No. 4 terminal Connector X(39P) No. 27 terminal Audio unit connector C (24P) No. 23 terminal Connector X (39P) No. 27 terminal HandsFreeLink control unit 28P connector No. 19 terminal Connector G (6P) No. 1 terminal Power seat control unit connector A (40P) No. 40 terminal Connector G (6P) No. 1 terminal Power tailgate control unit connector C (14P) No. 7 terminal Connector G (6P) No. 1 terminal AcuraLink control unit (XM receiver) connector B(16P) No. 5 terminal Connector G (6P) No. 1 terminal Rear MICU (rear fuse/ relay box connector B (34P) Is DTC B1000 also indicated? YES - Troubleshoot DTC B1000. NO - Intermittent failure, the system is OK at this time. Check for loose or poor connections at the MICU and B-CAN connected units in the table.

DTC B2152: Driver's MPCS Unit Internal (EEPROM) Error

Note. If you are troubleshooting multiple DTCs, be sure to follow the instructions in B-CAN System Diagnosis Test Mode A (see TROUBLESHOOTING - B-CAN SYSTEM DIAGNOSIS TEST MODE A ).

1. Clear the DTCs with the HDS.
2. Turn the ignition switch to LOCK (0), and then back ON (II).
3. Wait for 6 seconds or more.
4. Check for DTCs with the HDS. Is DTC B2152 indicated? YES - Replace the driver's MPCS unit. NO - Intermittent failure, the system is OK at this time.

DTC B2155: Driver's MPCS Unit Lost Communication with MICU (MICU Message); DTC B2156: Driver's MPCS Unit Lost Communication with MICU (MIRRORSW Message); DTC B2161: Driver's MPCS Unit Lost Communication with MICU (DOORSW Message)

Note. If you are troubleshooting multiple DTCs, be sure to follow the instructions in B-CAN System Diagnosis Test Mode A (see TROUBLESHOOTING - B-CAN SYSTEM DIAGNOSIS TEST MODE A ).

1. Clear the DTCs with the HDS.
2. Turn the ignition switch to LOCK (0), and then back ON (II).
3. Wait for 6 seconds or more.
4. Check for DTCs with the HDS. Are DTCs B2155, B2156, and/or B2161 indicated? YES - Go to step 5. NO - Intermittent failure, the system is OK at this time. Check for loose or poor connections between the driver's MPCS unit and the MICU.
5. Check for DTCs with the HDS. Are DTCs B1055, B1056, B1157, B1159, B1255, B1955, B2156, and/or B2161 also indicated? YES - Faulty MICU, replace the under-dash fuse/ relay box (see «REMOVAL AND INSTALLATION»(/acura/mdx/ii-2006-2010/remont/body-electrical/#under-dash-fuserelay-box__removal-and-installation) ). NO - Do the driver's MPCS unit input test (see «DRIVER'S MPCS UNIT INPUT TEST»(/acura/mdx/ii-2006-2010/remont/communication-devices/#multiplex-integrated-control-system__drivers-mpcs-unit-input-test) ).

DTC B2157: Driver's MPCS Unit Lost Communication with Gauge Control Module (ILLUMI Message); DTC B2160: Driver's MPCS Unit Lost Communication with Gauge Control Module (VSP/NE Message)

Note. If you are troubleshooting multiple DTCs, be sure to follow the instructions in B-CAN System Diagnosis Test Mode A (see TROUBLESHOOTING - B-CAN SYSTEM DIAGNOSIS TEST MODE A ).

1. Clear the DTCs with the HDS.
2. Turn the ignition switch to LOCK (0), and then back ON (II).
3. Wait for 6 seconds or more.
4. Check for DTCs with the HDS. Are DTCs B2157 and/or B2160 indicated? YES - Go to step 5. NO - Intermittent failure, the system is OK at this time. Check for loose or poor connections between the driver's MPCS unit and the gauge control module.
5. Check for DTCs with the HDS. Are DTCs B1011, B1060, B1061, B1205, B1206, B1207, B1359, B1906, B1956, B2157, and/or B2160 also indicated? YES - Do the gauge control module input test (see «GAUGE CONTROL MODULE INPUT TEST»(/acura/mdx/ii-2006-2010/remont/gauges-instrument-panels/#gauges__gauge-control-module-input-test) ). NO - Do the driver's MPCS unit input test (see «DRIVER'S MPCS UNIT INPUT TEST»(/acura/mdx/ii-2006-2010/remont/communication-devices/#multiplex-integrated-control-system__drivers-mpcs-unit-input-test) ).

DTC B2162: Driver's MPCS Unit Lost Communication with Relay Control Module (RM Message)

Note. If you are troubleshooting multiple DTCs, be sure to follow the instructions in B-CAN System Diagnosis Test Mode A (see TROUBLESHOOTING - B-CAN SYSTEM DIAGNOSIS TEST MODE A ).

1. Clear the DTCs with the HDS.
2. Turn the ignition switch to LOCK (0), and then back ON (II).
3. Wait for 6 seconds or more.
4. Check for DTCs with the HDS. Is DTC B2162 indicated? YES - Go to step 5. NO - Intermittent failure, the system is OK at this time. Check for loose or poor connections between the driver's MPCS unit and the relay control module.
5. Check for DTCs with the HDS. Are DTCs B1005, B1158, B1959, B2162, and/or B2970 also indicated? YES - Do the relay control module input test (see «RELAY CONTROL MODULE INPUT TEST»(/acura/mdx/ii-2006-2010/remont/communication-devices/#multiplex-integrated-control-system__relay-control-module-input-test) ). NO - Do the driver's MPCS unit input test (see «DRIVER'S MPCS UNIT INPUT TEST»(/acura/mdx/ii-2006-2010/remont/communication-devices/#multiplex-integrated-control-system__drivers-mpcs-unit-input-test) ).

MICU Input Test

Note. Before testing the MICU, troubleshoot the multiplex integrated control unit first, using B-CAN System Diagnosis Test Mode A (see TROUBLESHOOTING - B-CAN SYSTEM DIAGNOSIS TEST MODE A ).

Scheme 17

Scheme 18

1. Turn the ignition switch to LOCK (0).
2. Remove the left kick panel (see «TRIM REMOVAL/INSTALLATION - DOOR AREAS»(/acura/mdx/ii-2006-2010/remont/exteriorinterior-trim/#interior-trim__trim-removalinstallation-door-areas) ).
3. Disconnect under-dash fuse/relay box connectors D, E, F, G, H, J, N, P, Q, W, and X. NOTE: All connector views are wire side of female terminals.
4. 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 5.
5. With the connectors still disconnected, make these input tests at the connectors. 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 6. INPUT TESTS REFERENCE Cavity Wire Test condition Test: Desired result Possible cause if desired result is not obtained D11 LT GRN Under all conditions (Under-hood fuse/relay box connector E (14P) disconnected) Check for continuity between the D11 terminal and the under-hood fuse/relay box connector E (14P) No. 1 terminal: There should be continuity. An open in the wire Check for continuity to ground: There should be no continuity. A short to ground in the wire G1 LT GRN Under all conditions (Rear fuse/ relay box connector B (34P) disconnected) Check for continuity between the G1 terminal and the rear fuse/relay box connector B (34P) Non terminal: There should be continuity. An open in the wire Check for continuity to ground: There should be no continuity. A short to ground in the wire J4 LT GRN Under all conditions (Driver's MPCS unit connector A (40P) disconnected) Check for continuity between the J4 terminal and the driver's MPCS unit connector A (40P) No. 28 terminal: There should be continuity. An open in the wire Check for continuity to ground: There should be no continuity. A short to ground in the wire P6 LT BLU Under all conditions (MICU connector P (30P) disconnected) Check for continuity between the P6 terminal and the DLC Non terminal: There should be continuity. An open in the wire Check for continuity to ground: There should be no continuity. A short to ground in the wire N22 LT GRN Under all conditions (Gauge control module connector A (12P) disconnected) Check for continuity between the N22 terminal and the gauge control module connector A (12P) No. 5 terminal: There should be continuity. An open in the wire Check for continuity to ground: There should be no continuity. A short to ground in the wire N28 LT GRN Under all conditions (Combination switch control unit 8P connector disconnected) Check for continuity between the N28 terminal and the combination switch control unit 8P connector No. 4 terminal: There should be continuity. An open in the wire Check for continuity to ground: There should be no continuity. A short to ground in the wire X27 LT GRN Under all conditions (Immobilizer-keyless control unit 7P connector disconnected) Check for continuity between the X27 terminal and the immobilizer-keyless control unit 7P connector No. 4 terminal: There should be continuity. An open in the wire Check for continuity to ground: There should be no continuity. A short to ground in the wire X27 GRY Under all conditions (Climate control unit 40P connector disconnected) Check for continuity between the X27 terminal and the climate control unit 40P connector No. 4 terminal: There should be continuity. An open in the wire Check for continuity to ground: There should be no continuity. A short to ground in the wire X27 LT GRN Under all conditions (Audio unit connector C (24P) disconnected) Check for continuity between the X27 terminal and the audio unit connector C (24P) No. 23 terminal: There should be continuity. An open in the wire Check for continuity to ground: There should be no continuity. A short to ground in the wire X27 LT GRN Under all conditions (HandsFreeLink control unit 28P connector disconnected) Check for continuity between the X27 terminal and the HandsFreeLink control unit 28P connector No. 19 terminal: There should be continuity. An open in the wire Check for continuity to ground: There should be no continuity. A short to ground in the wire
6. Reconnect the connectors, and make these input tests at the connectors. 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 under-dash fuse/relay box (see «REMOVAL AND INSTALLATION»(/acura/mdx/ii-2006-2010/remont/body-electrical/#under-dash-fuserelay-box__removal-and-installation) ). INPUT TESTS REFERENCE Cavity Wire Test condition Test: Desired result Possible cause if desired result is not obtained E9 BLK Under all conditions Measure the voltage to ground: There should be less than 0.5 V. Poor ground (G601) An open in the wire H9 O4 P1 BRN Under all conditions Measure the voltage to ground: There should be less than 0.5 V. Poor ground (G502) An open in the wire F1 YEL Ignition switch ON (II) (Rear fuse/relay box connector B (34P) disconnected) Measure the voltage to ground: There should be battery voltage. Blown No. 21 (7.5 A) fuse in the under-dash fuse/relay box Faulty under-dash fuse/relay box A short to ground in the wire between the MICU and rear fuse/relay box G3 WHT Under all conditions (Rear fuse/relay box connector B (34P) disconnected) Measure the voltage to ground: There should be battery voltage. Blown No. 4 (40 A) fuse in the main under-hood fuse box Blown No. 7 (10 A) fuse in the under-dash fuse/relay box Faulty under-dash fuse/relay box A short to ground in the wire between the MICU and rear fuse/relay box F14 ORN Under all conditions Short connection to ground: The ignition key light should come on. Blown No. 4 (40 A) fuse in the main under-hood fuse box Blown No. 6(7.5 A) fuse in the under-dash fuse/relay box Faulty under-dash fuse/relay box Faulty ignition key light An open in the wire W4 LT GRN Under all conditions, (Interior lights switch in DOOR position) Short connection to ground: The interior lights should come on. Blown No. 4 (40 A) fuse in the main under-hood fuse box Blown No. 6 (7.5 A) fuse in the under-dash fuse/relay box Faulty under-dash fuse/relay box Blown map lights or ceiling light bulb(s) An open in the wire

Relay Control Module Input Test

Note. Before testing the relay control module, troubleshoot the multiplex integrated control unit first, using B-CAN System Diagnosis Test Mode A (see TROUBLESHOOTING - B-CAN SYSTEM DIAGNOSIS TEST MODE A ).

Scheme 19

1. Turn the ignition switch to LOCK (0).
2. Remove the under-hood fuse/relay box (see «REMOVAL AND INSTALLATION»(/acura/mdx/ii-2006-2010/remont/body-electrical/#under-hood-fuserelay-box) ).
3. Disconnect under-hood fuse/relay box connectors D (10P) and E (14P).
4. 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 5.
5. With the connectors still disconnected, make these input tests at the connectors. 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 6. INPUT TESTS REFERENCE Cavity Wire Test condition Test: Desired result Possible cause if desired result is not obtained E1 LT GRN Under all conditions (Under-dash fuse/relay box connector D(17P) disconnected Check for continuity between the E1 terminal and the under-dash fuse/ relay box connector D (17P) No. 11 terminal: There should be continuity. An open in the wire Check for continuity to ground: There should be no continuity. A short to ground in the wire
6. Reconnect the connectors, and make these input tests at the connectors. If any test indicates a problem, find and correct the cause, then recheck the system. If all the input tests prove OK, replace the relay control module. INPUT TESTS REFERENCE Cavity Wire Test condition Test: Desired result Possible cause if desired result is not obtained D4 BLK Under all conditions Measure the voltage to ground: There should be less than 0.5 V. Poor ground (G401) An open in the wire D6 WHT Under all conditions Measure the voltage to ground: There should be battery voltage. Blown No. 4 (40 A) fuse in the main under-hood fuse box Blown No. 7 (10 A) fuse in the under-dash fuse/relay box Faulty under-dash fuse/relay box An open in the wire D7 YEL Ignition switch ON (ID Measure the voltage to ground: There should be battery voltage. Blown No. 21 (7.5 A) fuse in the under-dash fuse/relay box Faulty under-dash fuse/relay box An open in the wire

Driver's MPCS Unit Input Test

Note. Before testing the driver's MPCS unit, troubleshoot the multiplex integrated control unit first, using B-CAN System Diagnosis Test Mode A (see TROUBLESHOOTING - B-CAN SYSTEM DIAGNOSIS TEST MODE A ).

Scheme 20

1. Turn the ignition switch to LOCK(O).
2. Remove the driver's door panel (see «FRONT DOOR PANEL REMOVAL/INSTALLATION»(/acura/mdx/ii-2006-2010/remont/exterior-body-panels/#doors__front-door-panel-removalinstallation) ).
3. Disconnect driver's MPCS unit connectors A (40P) and B (14P).
4. 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 5.
5. With the connectors still disconnected, make these input tests at the connectors. 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 6. INPUT TESTS REFERENCE Cavity Wire Test condition Test: Desired result Possible cause if desired result is not obtained A28 LT GRN Under all conditions (Under-dash fuse/relay box connector J (21P) disconnected Check for continuity between the A28 terminal and the under-dash fuse/relay box connector J (21P) Non terminal: There should be continuity. An open in the wire. Check for continuity to ground: There should be no continuity. A short to ground in the wire
6. Reconnect the connectors, and make these input tests at the connectors. If any test indicates a problem, find and correct the cause, then recheck the system. If all the input tests prove OK, replace the driver's MPCS unit. INPUT TESTS REFERENCE Cavity Wire Test condition Test: Desired result Possible cause if desired result is not obtained A5 BLK Under all conditions Measure the voltage to ground: There should be less than 0.5 V. Poor ground (G401) An open in the wire B14 A7 WHT Under all conditions Measure the voltage to ground: There should be battery voltage. Blown No. 4 (40 A) fuse in the main under-hood fuse box Blown No. 7 (10 A) fuse in the under-dash fuse/relay box Faulty under-dash fuse/relay box An open in the wire A25 YEL Ignition switch ON (II) Measure the voltage to ground: There should be battery voltage. Blown No. 21 (7.5 A) fuse in the under-dash fuse/relay box Faulty under-dash fuse/relay box An open in the wire

Rear MICU Input Test

Note. Before testing the rear MICU, troubleshoot the multiplex integrated control unit first, using B-CAN System Diagnosis Test Mode A (see TROUBLESHOOTING - B-CAN SYSTEM DIAGNOSIS TEST MODE A ).

Scheme 21

Scheme 22

1. Turn the ignition switch to LOCK (0).
2. Remove the left rear trim (see «TRIM REMOVAL/INSTALLATION - REAR SIDE AREA»(/acura/mdx/ii-2006-2010/remont/exteriorinterior-trim/#interior-trim__trim-removalinstallation-rear-side-area) ).
3. Disconnect rear fuse/relay box connectors B (34P) and C (42P).
4. 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 5.
5. With the connectors still disconnected, make these input tests at the connectors. 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 6. INPUT TESTS REFERENCE Cavity Wire Test condition Test: Desired result Possible cause if desired result is not obtained B2 LT GRN Under all conditions (Under-dash fuse/relay box connector G (6P) disconnected Check for continuity between the B2 terminal and the under-dash fuse/ relay box connector G (6P) No. 1 terminal: There should be continuity. An open in the wire Check for continuity to ground: There should be no continuity. A short to ground in the wire B14 LT GRN Under all conditions (Power seat control unit connector A (40P) disconnected) Check for continuity between the B14 terminal and the power seat control unit connector A (40P) No. 40 terminal: There should be continuity. An open in the wire Check for continuity to ground: There should be no continuity. A short to ground in the wire C16 (1) LT GRN Under all conditions (Power tailgate control unit connector C (HP) disconnected) Check for continuity between the C16 terminal and the power tailgate control unit connector C(14P) No. 7 terminal: There should be continuity. An open in the wire Check for continuity to ground: There should be no continuity. A short to ground in the wire C32 (2) LT GRN Under all conditions (AcuraLink control unit (XM receiver) connector B (16P) disconnected) Check for continuity between the C32 terminal and the (AcuraLink control unit (XM receiver) connector B (16P) No. 5 terminal: There should be continuity. An open in the wire Check for continuity to ground: There should be no continuity. A short to ground in the wire (1) With power tailgate (2) With AcuraLink
6. Reconnect the connectors, and make these input tests at the connectors. If any test indicates a problem, find and correct the cause, then recheck the system. If all the input tests prove OK, the rear MICU must be faulty, replace the rear fuse/relay box (see «REMOVAL AND INSTALLATION»(/acura/mdx/ii-2006-2010/remont/body-electrical/#rear-fuserelay-box__removal-and-installation) ). INPUT TESTS REFERENCE Cavity Wire Test condition Test: Desired result Possible cause if desired result is not obtained B18 BLK Under all conditions Measure the voltage to ground: There should be less than 0.5 V. Poor ground (G603, G604) An open in the wire B29 B4 WHT Under all conditions Measure the voltage to ground: There should be battery voltage. Blown No. 4 (40 A) fuse in the main under-hood fuse box Blown No. 7 (10 A) fuse in the under-dash fuse/relay box Faulty under-dash fuse/relay box Faulty rear fuse/relay box An open in the wire B23 YEL Ignition switch ON (ID Measure the voltage to ground: There should be battery voltage. Blown No. 21 (7.5 A) fuse in the under-dash fuse/relay box Faulty under-dash fuse/relay box Faulty rear fuse/relay box An open in the wire

See also:
• GENERAL TROUBLESHOOTING INFORMATION
• B1575
• B1051
• B1055
• B1060
• B1062
• B1065
• B1075
• B1076
• B1077
• B1078
• B1152
• B1155
• B1157
• B1158
• B1162
• B1168
• B1175
• B1176
• B1182
• B1202
• B1205
• B1213
• B2969
• B2970
• B1252
• B1255
• B1275
• B1279
• B1280
• B1281
• B1352
• B1376
• B1775
• B1776
• B1779
• B1780
• B1785
• B1786
• B1792
• B1905
• B1906
• B1955
• B1956
• B1957
• B1959
• B1802
• B1805
• B1806
• B1812
• B1825
• B1826
• B1827
• B1828
• B1829
• B1835
• B1836
• B1837
• B1840
• B1841
• B1842
• B1843
• B1844
• B1845
• B1846
• B1847
• B2175
• B2176
• B2177
• B2178
• B2179
• B2180
• B2181
• B2182
• B2183
• B2184
• B2185
• B2186
• B2187
• B2188
• B2189
• B2190
• B2191
• B2202
• B2204
• B2205
• B2240
• SELF-DIAGNOSTIC FUNCTION
• GAUGE CONTROL MODULE INPUT TEST
• DRIVER'S MPCS UNIT INPUT TEST
• WIPER/WASHER SWITCH (COMBINATION SWITCH CONTROL UNIT) INPUT TEST
• IMMOBILIZER-KEYLESS CONTROL UNIT INPUT TEST
• POWER SEAT CONTROL UNIT INPUT TEST
• CONTROL UNIT INPUT TEST/REPLACEMENT
• TRIM REMOVAL/INSTALLATION - DOOR AREAS
• BATTERY TEST
• REMOVAL AND INSTALLATION
• REMOVAL AND INSTALLATION
• FRONT DOOR PANEL REMOVAL/INSTALLATION
• TRIM REMOVAL/INSTALLATION - REAR SIDE AREA
• REMOVAL AND INSTALLATION
• B-CAN SYSTEM DIAGNOSIS TEST MODE A
• TEST MODE 1
• B1000
• B1001
• B1005
• B1007
• B1011
• B1012
• B1013
• B1032
• B1050
• B1080
• B2152
• B2155
• B2157
• B2162
• SLEEP AND WAKE-UP MODE TEST
• LOSS OF COMMUNICATION DTC CROSS-REFERENCE CHART
• MICU INPUT TEST
• RELAY CONTROL MODULE INPUT TEST
• REAR MICU INPUT TEST
• DRIVER'S MPCS UNIT INPUT TEST