Multiplex Integrated Control System Acura RDX I

Scheme 1

Troubleshooting CAN Circuit Related Problems

Note. Check the 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 to check for "Connected units" and DTCs (see «TROUBLESHOOTING - B-CAN SYSTEM DIAGNOSIS TEST MODE A»(/acura/rdx/i-2006-2009/remont/communication-devices/#multiplex-integrated-control-system__troubleshooting-b-can-system-diagnosis-test) ).
2. If no DTCs are retrieved, go to B-CAN System Diagnosis Test Mode C (see «TROUBLESHOOTING - B-CAN SYSTEM DIAGNOSIS TEST MODE C»(/acura/rdx/i-2006-2009/remont/communication-devices/#multiplex-integrated-control-system__troubleshooting-b-can-system-diagnosis-test) ) or D (see «TROUBLESHOOTING - B-CAN SYSTEM DIAGNOSIS TEST MODE D»(/acura/rdx/i-2006-2009/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/rdx/i-2006-2009/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) Signal error DTCs
4. If no DTCs are retrieved, use B-CAN System Diagnostic Test Mode 2 to check all inputs related to failure (see step 10 ).

How to display DTCs on the gauge control module

Enter the B-CAN System Diagnosis Test Mode 1 (see TROUBLESHOOTING - B-CAN SYSTEM DIAGNOSIS TEST MODE 1 AND TEST MODE 2 (WITHOUT THE HDS) ). 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 LCD display when the communication between the MICU and the gauge control module is normal. To scroll through the DTCs, press the select/reset button.

Scheme 2

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

CONTROL UNIT REFERENCE

How to clear the DTC

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) ). While in Test Mode 1, press and hold down the SELECT/RESET button for more than 10 seconds.

Loss of Communication DTC cross-reference chart

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

1. Find the Transmitting Control Unit that is in the same row as all of the loss of communication DTCs retrieved.
2. Do the input test for the transmitting control unit.

TROUBLE SHOUTING CHART (BUS OFF AND INTERNAL ERROR CODES)

TROUBLE SHOUTING CHART

DTC Troubleshooting Index

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

1. Battery voltage DTCs
2. Internal error DTCs
3. Loss of communication DTCs (beginning with the lowest number first; for example, if B1008 and B1011 are retrieved, troubleshoot B1008 first).
4. Signal error DTCs

DTC TROUBLE SHOUTING CHART (MICU)

DTC TROUBLE SHOUTING CHART (GAUGE CONTROL MODULE)

DTC TROUBLE SHOUTING CHART (CLIMATE CONTROL UNIT)

DTC TROUBLE SHOUTING CHART (HANDSFREELINK CONTROL UNIT)

DTC TROUBLE SHOUTING CHART (POWER SEAT CONTROL UNIT)

DTC TROUBLE SHOUTING CHART (IMMOBILIZER-KEYLESS CONTROL UNIT)

DTC TROUBLE SHOUTING CHART - ACURALINK CONTROL UNIT (XM RECEIVER)

MICU Control Functions Index

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

Refer to each system circuit diagram for details.

MICU CONTROL FUNCTIONS INDEX

The MICU also controls the function of these circuits

1. Entry lights control (front individual map lights and ceiling light)
2. Exterior lights control (including the daytime running lights control)
3. Horn
4. Interlock system
5. Key-in reminder
6. Keyless entry
7. Lights-on reminder
8. Power door locks
9. Power window key-off timer
10. Seat belt reminder
11. Security alarm
12. Turn signal/hazard warning lights
13. Wiper/washer

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

Note. *1 :USA models with navigation *2 :With navigation *3 : '08-'09 models

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 LCD display on the gauge control module can indicate the error messages by entering the gauge self-diagnostic function (see SELF-DIAGNOSTIC FUNCTION ).

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 line called K-LINE. The K-LINE is distinguished 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 its self.

Scheme 5

1. *1 :USA models with navigation
2. *2 :With navigation
3. *3 : '08-'09 models

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 OFF.

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 OFF, 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 a key is in the ignition.
5. The draw is reduced from 200 mA to less than 35 mA when in the sleep mode.

Note. 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 an 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

Entry Lights Control System

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

ENTRY LIGHTS CONTROL SYSTEM FUNCTION CHART

Lighting System (Headlights, Parking Lights, Side Marker Lights, Fog Lights, License Plate Lights, and Taillights)

The MICU contains the relay circuits of the headlight high/low beam and taillights, and controls the lighting system ON/OFF based upon the input signals from the combination light switch.

MICU INPUT/OUTPUT CHART

Daytime Running Lights

The MICU controls the exterior lights and daytime running lights based upon the input signals from each switch.

MICU INPUT/OUTPUT CHART

Turn Signal/Hazard Warning Lights

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

MICU INPUT/OUTPUT CHART

Power Door Locks (Vehicle Speed Sense)

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

MICU INPUT/OUTPUT CHART

Power Door Locks (Normally LOCK/UNLOCK Operation)

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

MICU INPUT/OUTPUT CHART

Door Lock Response Operation

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

MICU INPUT/OUTPUT CHART

Power Window Key-off Operation

The MICU controls the power windows key-off operation based upon the input signals.

MICU INPUT/OUTPUT CHART

Keyless Entry System

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

MICU INPUT/OUTPUT CHART

Keyless PANIC

The MICU controls the keyless PANIC based upon the B-CAN signals.

MICU INPUT/OUTPUT CHART

Security Alarm System

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

MICU INPUT/OUTPUT CHART

Key Interlock

The MICU controls the key interlock solenoid based upon the IG1, the transmission range switch, and the park-pin switch signals.

MICU INPUT/OUTPUT CHART

Answer Back Response Operation

The MICU controls the lighting system and keyless buzzer based upon the B-CAN signals.

B-CAN INPUT/OUTPUT CHART

Windshield Wiper/Washer

The MICU controls the windshield wiper motor and the washer motor based upon the IG1, wiper/washer switch windshield wiper motor signals and the B-CAN signals.

MICU INPUT/OUTPUT CHART

Rear Wiper/Washer

The MICU controls the rear wiper motor and the washer motor based upon the IG1, wiper/washer switch and the rear wiper motor signals.

MICU INPUT/OUTPUT CHART

Collision Detection Signal (CDS)

The MICU controls the door lock actuators based upon the IG1 and the B-CAN signals.

MICU INPUT/OUTPUT CHART

HDS Inputs and Commands

Certain inputs happen so quickly that the HDS cannot 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.

DATA LIST REFERENCE (INPUT)

DATA LIST REFERENCE (FUNCTION TEST)

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

Scheme 6

1. Compare the symptom with this list of B-CAN related systems: Gauge control module Exterior lights Turn signals Entry light control Interior lights Door-open and tailgate-open indicators Horns (security and panic) Chimes (key-in, seat belt, lights-on, and parking brake) Power window/moonroof timer Wiper/washer Security Keyless entry Power door locks Key interlock Dash light brightness 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 to the data link connector (A), then turn the ignition switch 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 Immobilizer-keyless control unit Climate control unit HandsFreeLink control unit (with navigation) Acuralink control unit (XM receiver) (USA models with navigation) 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 units are not communicating, go to B-CAN System Diagnosis Test Mode B (see «TROUBLESHOOTING - B-CAN SYSTEM DIAGNOSIS TEST MODE B»(/acura/rdx/i-2006-2009/remont/communication-devices/#multiplex-integrated-control-system__troubleshooting-b-can-system-diagnosis-test) ). If all units are not communicating or only the MICU is communicating, go to DTC B1000 troubleshooting (see «DTC B1000»(/acura/rdx/i-2006-2009/remont/communication-devices/#multiplex-integrated-control-system__dtc-b1000) ).
4. Select the system that has the problem from the 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 B-CAN System Diagnosis Test Mode C (see «TROUBLESHOOTING - B-CAN SYSTEM DIAGNOSIS TEST MODE C»(/acura/rdx/i-2006-2009/remont/communication-devices/#multiplex-integrated-control-system__troubleshooting-b-can-system-diagnosis-test) ) if the system does not stop or turn off. Go to Test Mode D (see «TROUBLESHOOTING - B-CAN SYSTEM DIAGNOSIS TEST MODE D»(/acura/rdx/i-2006-2009/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 Horn (security and panic) Wiper/washer If the problem is related to one of the following items, go to the troubleshooting for that individual system. Gauge control module Door-open and tailgate-open indicators Chimes (key-in, seat belt, lights-on, and parking brake) Security Keyless entry Key interlock Dash light brightness Audio system Navigation (if equipped)
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). 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 menu.
2. Select DTCs, and then check for loss of communication DTCs. 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.

COMMUNICATION REFERENCE

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 HDS INPUTS AND COMMANDS ). 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»(/acura/rdx/i-2006-2009/remont/communication-devices/#multiplex-integrated-control-system__troubleshooting-b-can-system-diagnosis-test) ). 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.
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. Are 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 HDS INPUTS AND COMMANDS ). 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»(/acura/rdx/i-2006-2009/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 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 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. 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 7

1. Check the No. 23 (10A) fuse in the under-hood fuse/relay box and No. 10 (7.5A) fuse 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 driver's dashboard undercover (see «DRIVER'S DASHBOARD UNDERCOVER REMOVAL/INSTALLATION»(/acura/rdx/i-2006-2009/remont/gauges-instrument-panels/#dashboard-instrument-panel__drivers-dashboard-undercover-removalinstallation) ).
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 MICU service check connector socket (B) in the under-dash fuse/relay box.
5. Wait 5 seconds, and watch the ceiling light. When the ceiling light flashes quickly once, and then goes 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) 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 code 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 light will blink once. If the circuit is faulty, there will be no indication. TROUBLESHOOTING CHART (MICU) Item Driver's door lock switch (UNLOCK) Driver's door lock switch (LOCK) Driver's door lock knob switch (UNLOCK) Driver's door lock knob switch (LOCK) Driver's door key cylinder switch (UNLOCK) (1) Driver's door key cylinder switch (LOCK) (1) Front passenger's door lock switch (UNLOCK) Front passenger's door lock switch (LOCK) Front passenger's door lock knob switch (UNLOCK) Left rear door lock knob switch (UNLOCK) Right rear door lock knob switch (UNLOCK) Driver's door switch (OPEN) Front passenger's door switch (OPEN) Left rear door switch (OPEN) Right rear door switch (OPEN) Trunk lid/Tailgate switch (OPEN) Audio switch Windshield wiper HI/LO switch Windshield wiper INT/LO switch Windshield wiper MIST switch Windshield washer switch (ON) Windshield wiper intermittent dwell time controller Turn signal switch (LEFT) Turn signal switch (RIGHT) Hazard warning switch (ON) Headlight switch (ON) Headlight switch (OFF) Lighting switch (ON) Dimmer switch (ON) Passing switch (ON) Hood switch (OPEN) Transmission range switch (P) Brake switch (ON) Fog light switch Ignition key cylinder switch Windshield wiper motor park switch Rear washer switch Rear wiper motor park switch Rear wiper switch (ON) Transmission range switch (R) A/C pressure switch/thermal protector (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. Does the ceiling light work properly in all switch positions? 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 OFF, and remove the key, then open 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)
2. Confirm the sleep mode: Check for voltage on the B-CAN communication line (PNK wires); there should be battery voltage in the sleep mode. Check the parasitic draw at the battery while shifting into the sleep mode; amperage should change from about 200 mA to less than 35 mA.
3. Shift to the wake up mode: When the ignition switch is turned ON (II), the MICU, gauge control module, immobilizer-keyless control unit-receiver, and PCM wake up at the same time without "talking" to each other through the communication lines. When any switch in the multiplex integrated control system is turned on, it wakes up its related control unit which, in turn, wakes up the other units. 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 8

Scheme 9

Scheme 10

Scheme 11

DTC B1000

Communication Bus Line Error (BUS-OFF)

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 12

Scheme 13

1. Clear the DTCs with the HDS.
2. Turn the ignition switch OFF, 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/rdx/i-2006-2009/remont/body-electrical/#battery) ) and the charging system.
5. Check for DTCs with the HDS. Are DTCs B1008, B1011, and B1032 also indicated with DTC B1000? YES - Go to step 6. NO - Faulty MICU; replace the under-dash fuse/relay box.
6. Turn the ignition switch OFF.
7. Disconnect the appropriate connector at each control unit in the table one at a time. Clear the DTCs, then recheck for DTCs after each unit is disconnected. CONNECTOR SPECIFICATION Control Unit Appropriate Connector Gauge control module 36P connector Immobilizer-keyless control unit 7P connector Climate control unit Connector B (16P) AcuraLink control unit Connector B (16P) HandsFreeLink control unit 22P connector Power Seat Control Unit Connector A (40P) Is DTC B1000 indicated with each individual unit disconnected? YES - Go to step 8. NO - Replace the control unit that was disconnected and B1000 did not reset.
8. Disconnect under-dash fuse/relay box connector Q (16P).
9. Check for continuity between under-dash fuse/relay box connector Q (16P) No. 6 terminal and body ground. Is there continuity? YES - Repair a short to ground in the wire. NO - Go to step 10.
10. Turn the ignition switch ON (II).
11. Check for voltage between under-dash fuse/relay box connector Q (16P) No. 6 terminal and body ground. Is there voltage? YES - Repair a short to power in the wire between the under-dash fuse/relay box connector, the junction box, and the affected control unit. 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 OFF, 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 B1008: MICU Lost Communication with Gauge Control Module (A/T 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 OFF, and then back ON (II).
3. Wait for 6 seconds or more.
4. Check for DTCs with the HDS. Is DTC B1008 indicated? YES - Go to step 5. NO - Intermittent failure, the gauge control module is OK at this time. Check for loose or poor connections at the gauge control module 36P connector and at under-dash fuse/relay box connector Q (16P). If the connections are good, check the battery condition (see «BATTERY TEST»(/acura/rdx/i-2006-2009/remont/body-electrical/#battery) ) and the charging system.
5. Check for DTCs with the HDS. : Are DTCs B1011 and B1032 also indicated with DTC B1008? YES - Check for an open in the communication circuit between the MICU and the gauge control module. If the circuit is bad, repair the open. NO - Go to the gauge control module input test (see «GAUGE CONTROL MODULE INPUT TEST»(/acura/rdx/i-2006-2009/remont/gauges-instrument-panels/#gauges__gauge-control-module-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 OFF, 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 gauge control module is OK at this time. Check for loose or poor connections at the gauge control module 36P connector and at under-dash fuse/relay box connector Q (16P). If the connections are good, check the battery condition (see «BATTERY TEST»(/acura/rdx/i-2006-2009/remont/body-electrical/#battery) ) and the charging system.
5. Check for DTCs with the HDS. Are DTCs B1008 and B1032 also indicated with DTC B1011? YES - Check for an open in the communication circuit between the MICU and the gauge control module. If the circuit is bad, repair the open. NO - Go to the gauge control module input test (see «GAUGE CONTROL MODULE INPUT TEST»(/acura/rdx/i-2006-2009/remont/gauges-instrument-panels/#gauges__gauge-control-module-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 OFF, 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 gauge control module is OK at this time. Check for loose or poor connections at the gauge control module 36P connector and at under-dash fuse/relay box connector Q (16P). If the connections are good, check the battery condition (see «BATTERY TEST»(/acura/rdx/i-2006-2009/remont/body-electrical/#battery) ) and the charging system.
5. Check for DTCs with the HDS. Are DTCs B1008 and B1011 also indicated with DTC B1032? YES - Check for an open in the communication circuit 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/rdx/i-2006-2009/remont/gauges-instrument-panels/#gauges__gauge-control-module-input-test) ).

DTC B1036: IG1 Line Input 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 ).

Scheme 14

1. Clear the DTCs with the HDS.
2. Turn the ignition switch OFF, and then back ON (II).
3. Wait for 6 seconds or more.
4. Check for DTCs with the HDS. Is DTC B1036 indicated? YES - Go to step 5. NO - Intermittent failure, the system is OK at this time. Check for loose or poor connection at the gauge control module 36P connector, and at under-dash fuse/relay box connector Q (16P). If the connections are good, check the battery condition (see «BATTERY TEST»(/acura/rdx/i-2006-2009/remont/body-electrical/#battery) ) and the charging system.
5. Check for DTCs with the HDS. Is DTC B1008 indicated with DTC B1036? YES - Troubleshoot the indicated DTC. NO - Go to step 6.
6. Turn the ignition switch OFF.
7. Turn the ignition switch ON (II).
8. Check for voltage between the gauge control module 36P connector No. 35 and No. 19 terminals. Is there battery voltage? YES - Faulty MICU; substitute a known-good under-dash fuse/relay box and recheck. NO - Check No. 10 (7.5A) fuse in the under-dash fuse/relay box. If the fuse is OK, check for an open in the wire between the under-dash fuse/relay box and the gauge control module, or repair a short in the wire between the under-dash fuse/relay box and the gauge control module.

DTC B1150: Communication Bus Line Error; DTC B1200: Communication Bus Line Error; DTC B1750: Communication Bus Line Error; DTC B1800: Communication Bus Line Error; DTC B1900: 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 OFF, and then back ON (II).
3. Wait for 6 seconds or more.
4. Check for DTCs with the HDS. Are DTCs B1150, B1200, B1750, B1800, B1900, 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. CONNECTOR SPECIFICATION Junction box connector B-CAN connected unit connector Connector J (22P) No. 19 terminal Under-dash fuse/relay box connector Q (16P) No. 6 terminal Connector C (14P) No. 14 terminal Gauge control module 36P connector No. 30 terminal Connector G (14P) No. 1 terminal Immobilizer-keyless control unit 7P connector No. 4 terminal Connector B (6P) No. 5 terminal Climate control unit connector B (16P) No. 8 terminal Connector L (10P) No. 10 terminal HandsFreeLink control unit 22P connector No. 14 terminal Connector L (10P) No. 10 terminal Power seat control unit connector A (40P) No. 40 terminal Connector L (10P) No. 9 terminal AcuraLink control unit (XM receiver) connector B(16P) No. 5 terminal 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.

Scheme 15

Scheme 16

1. Before troubleshooting the multiplex integrated control system, refer to B-CAN System Diagnosis Test Mode A (see «TROUBLESHOOTING - B-CAN SYSTEM DIAGNOSIS TEST MODE A»(/acura/rdx/i-2006-2009/remont/communication-devices/#multiplex-integrated-control-system__troubleshooting-b-can-system-diagnosis-test) ).
2. Check the No. 10 (7.5A) fuse in the under-dash fuse/relay box. If any fuse is blown, replace it and go to step 3.
3. Disconnect under-dash fuse/relay box connectors E, F, G, K, and T. NOTE: All connector views are shown from 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 connector still disconnected, make these input tests at the appropriate connector. 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. PROBLEM SYMPTOM CHART Cavity Wire Test condition Test: Desired result Possible cause if desired result is not obtained K4 PNK Under all conditions Attach to ground: The ceiling light should come on. Blown No. 22 (7.5 A) fuse in the under-hood fuse/relay box Blown bulb(s) Faulty ceiling light An open in the wire
6. Reconnect the connectors to the under-dash fuse/relay box, 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. PROBLEM SYMPTOM CHART Cavity Wire Test condition Test: Desired result Possible cause if desired result is not obtained G2 GRN Under all conditions Measure the voltage to ground: There should be battery voltage. Blown No. 23 (10 A) fuse in the under-hood fuse/relay box An open in the wire E6 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 E33 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 F20 BLK Under all conditions Measure the voltage to ground: There should be less than 0.5 V. Poor ground (G451) An open in the wire T34 BLK Under all conditions Measure the voltage to ground: There should be less than 0.5 V. Poor ground (G501) An open in the wire

See also:
• GENERAL TROUBLESHOOTING INFORMATION
• B1026
• B1028
• B1077
• B1078
• B1127
• B1128
• B1129
• B1275
• B1279
• B1280
• B1281
• B1152
• B1155
• B1168
• B1170
• B1173
• B1175
• B1176
• B1177
• B1178
• B1187
• B1205
• B1225
• B1775
• B1792
• B1802
• B1805
• B1806
• B1807
• B1825
• B1826
• B1827
• B1828
• B1829
• B1836
• B1837
• B1843
• B1844
• B1845
• B1846
• B1847
• B1905
• B1906
• B2204
• B2205
• B2207
• B2240
• SELF-DIAGNOSTIC FUNCTION
• GAUGE CONTROL MODULE INPUT TEST
• IMMOBILIZER-KEYLESS CONTROL UNIT INPUT TEST
• DRIVER'S DASHBOARD UNDERCOVER REMOVAL/INSTALLATION
• BATTERY TEST
• TROUBLESHOOTING - B-CAN SYSTEM DIAGNOSIS TEST MODE A
• B1000
• B1001
• B1008
• B1011
• B1032
• B1036
• B1150
• SLEEP AND WAKE-UP MODE TEST
• MICU INPUT TEST
• HDS INPUTS AND COMMANDS