Multiplex Integrated Control System (4-cyl) Acura TSX II

Scheme 54

Scheme 55

Scheme 56

Scheme 57

Troubleshooting CAN Circuit Related Problems

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

Using the HDS (Preferred method)

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

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

First method; On the HDS, select BODY ELECTRICAL, then select the subsystem that relates to the problem (for example: door locks, keyless, security, etc.), and then last, select the DTCs.

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

Using the B-CAN System Diagnosis Test Mode 1 (Use only if the HDS is unavailable)

1. Check for communication circuit problems using B-CAN System Diagnostic Test Mode 1 (see «TROUBLESHOOTING - B-CAN SYSTEM DIAGNOSIS TEST MODE 1 AND TEST MODE 2 (WITHOUT THE HDS)»(/acura/tsx/ii-2008-2014/remont/communication-devices/#multiplex-integrated-control-system-4-cyl__troubleshooting-b-can-system-diagnosis-test) ).
2. Check for DTCs.
3. If multiple DTCs are stored, sort them, and then-troubleshoot the DTCs in this order: Battery voltage DTCs Internal error DTCs Loss of communication DTCs NOTE: If DTC U1280 is stored, troubleshoot DTC U1280 first (see «DTC U1280: COMMUNICATION BUS LINE ERROR (BUS-OFF)»(/acura/tsx/ii-2008-2014/remont/communication-devices/#multiplex-integrated-control-system-4-cyl__dtc-u1280-communication-bus-line-error) ). 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 «TROUBLESHOOTING - B-CAN SYSTEM DIAGNOSIS TEST MODE 1 AND TEST MODE 2 (WITHOUT THE HDS)»(/acura/tsx/ii-2008-2014/remont/communication-devices/#multiplex-integrated-control-system-4-cyl__troubleshooting-b-can-system-diagnosis-test) ).

How to Display DTCs on the MID of 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 multi-information display when the communication between the MICU and the gauge control module is normal. To scroll through the DTCs, press the SEL/RESET button.

Scheme 58

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

CONTROL UNIT REFERENCE CHART

How to Clear DTCs

1. 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)»(/acura/tsx/ii-2008-2014/remont/communication-devices/#multiplex-integrated-control-system-4-cyl__troubleshooting-b-can-system-diagnosis-test) ).
2. While in Test Mode 1, press and hold down the SEL/RESET button for at least 10 seconds to clear the DTCs.

Loss of Communication DTC Cross-Reference Chart

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

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 CHART

Loss of Communication

TRANSMITTING CONTROL UNIT REFERENCE CHART

DTC Troubleshooting Index

Note. Record all DTCs, and sort them by DTC type using the following DTC troubleshooting indexes, then troubleshoot the DTC(s) in this order

1. Battery voltage DTCs
2. Internal error DTCs
3. Loss of communication DTCs
4. Signal error DTCs

Drivers MICU

DTC DESCRIPTION CHART

Passenger's MICU

DTC DESCRIPTION CHART

Immobilizer-Keyless Control Unit

DTC DESCRIPTION CHART

Door Multiplex Control Unit

DTC DESCRIPTION CHART

Gauge Control Module

DTC DESCRIPTION CHART

HandsFreeLink Control Unit

DTC DESCRIPTION CHART

DTC DESCRIPTION CHART

AcuraLink Control Unit

DTC DESCRIPTION CHART

Power Seat Control Unit

DTC DESCRIPTION CHART

Power Tailgate Control Unit

DTC DESCRIPTION CHART

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

The body controller area network (B-CAN) and the fast controller area network (F-CAN) share information between multiple electronic control units (ECUs). B-CAN communication moves at a slower speed (125 kbps) for convenience related items and for other functions. F-CAN information moves at a faster speed (500 kbps) for "real time" functions such as fuel and emissions data. To allow both systems to share information, the gauge control module translates and relays the information from B-CAN to F-CAN and from F-CAN to B-CAN. This is called the Gateway Function.

Scheme 59

Gateway Function

The gauge control module acts as a gateway to allow both systems to share information. The gauge control module translates and relays the information from B-CAN to F-CAN and from F-CAN to B-CAN.

Scheme 60

Network "Loss of Communication" Error Checking Function

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

Scheme 61

Self-Diagnostic Function (On-Board Diagnosis)

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

Scheme 62

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).

1. In the sleep mode, the multiplex integrated control system stops functioning (communication and CPU control) when it is not necessary for the system to operate.
2. As soon as any operation is requested (for example, a door is unlocked), the related control units in the sleep mode immediately wake up and begin to function.
3. When the ignition switch is turned to LOCK (0), and the driver's door is opened, then closed, there is a delay of 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 or the tailgate is open, or if a key is in the ignition switch.
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 (see «SLEEP AND WAKE-UP MODE TEST»(/acura/tsx/ii-2008-2014/remont/communication-devices/#multiplex-integrated-control-system-4-cyl__sleep-and-wake-up-mode-test) ).

Fail-Safe Function

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

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

Hardware Fail-Safe Control

When a CPU problem or an abnormal power supply voltage is detected, the MICUs move 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 data is recognized, the MICUs move to the software fail-safe mode. The data that was not received is forced to a pre-programmed value.

Power Supply Voltage Monitoring Function

The driver's MICU monitors the power supply voltage (back-up voltage). If the voltage goes below 10 V, the driver's MICU will not store a DTC.

INPUT AND OUTPUT REFERENCE CHART

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

The driver's MICU control of the interior light ON/OFF is based on input signals from each switch.

INPUT AND OUTPUT REFERENCE CHART

Collision Detection Signal (CDS)

The driver's MICU control of the door lock actuators is based on IG1 and SRS (CDS) inputs.

INPUT AND OUTPUT REFERENCE CHART

Key Interlock (A/T)

The driver's MICU control of the key interlock solenoid is based on ignition switch ACCESSORY (I) position, the transmission range switch P position, and the park-pin switch inputs.

INPUT AND OUTPUT REFERENCE CHART

Rear Window Defogger Timer Operation

The driver's MICU control of the rear window defogger timer is based on ignition switch and rear window defogger switch inputs.

INPUT AND OUTPUT REFERENCE CHART

Combination Light Switch

The driver's MICU control of the lighting system is based on inputs from the combination light switch.

INPUT AND OUTPUT REFERENCE CHART

Daytime Running Lights

The driver's MICU control of the headlights as daytime running lights is based on inputs from each switch.

INPUT AND OUTPUT REFERENCE CHART

Fog Lights

The driver's MICU control of fog lights is based on inputs from the fog light switch.

INPUT AND OUTPUT REFERENCE CHART

Headlight Auto-OFF Function

The driver's MICU control of the lighting system is based on inputs from each switch.

INPUT AND OUTPUT REFERENCE CHART

Turn Signal/Hazard Warning Lights

The driver's MICU control of the turn signal/hazard warning lights is based on inputs from the turn signal switch and the hazard warning switch.

INPUT AND OUTPUT REFERENCE CHART

Courtesy Light (Driver's Side)

The driver's MICU control of the driver's and left rear door courtesy lights is based on inputs from the driver's and left rear door switches.

INPUT AND OUTPUT REFERENCE CHART

Wiper

The driver's MICU control of the wiper is based on inputs from each switch.

INPUT AND OUTPUT REFERENCE CHART

Driver's Power Window Relay

The driver's MICU control of the power windows is based on inputs from each switch.

INPUT AND OUTPUT REFERENCE CHART

Keyless Answer Back

The driver's MICU control of the lighting system and horns is based on keyless signals sent by the B-CAN data.

INPUT AND OUTPUT REFERENCE CHART

Security Answer Back

The driver's MICU control of the lighting system and horns is based on keyless signals sent by the B-CAN data.

INPUT AND OUTPUT REFERENCE CHART

Answer Back Response Operation

The driver's MICU control of the lighting system and horns is based on keyless signals sent by the B-CAN data.

INPUT AND OUTPUT REFERENCE CHART

Power Door Locks

The driver's MICU control of the door lock actuators is based on inputs from each switch.

INPUT AND OUTPUT REFERENCE CHART

Door Lock Response Operation

The driver's MICU control of the door lock actuators LOCK, UNLOCK, DRIVER'S UNLOCK, TRUNK UNLOCK is based on the B-CAN door lock switch signals.

INPUT AND OUTPUT REFERENCE CHART

Keyless Entry System

The driver's MICU control of the door lock actuators is based on inputs from each switch.

INPUT AND OUTPUT REFERENCE CHART

Keyless PANIC Operation

The driver's MICU control of the keyless PANIC operation is based on keyless signal sent by the B-CAN data.

INPUT AND OUTPUT REFERENCE CHART

Auto Power Door Locks (LOCK Operation)

The driver's MICU control of the door lock actuators is based on inputs from each switch.

INPUT AND OUTPUT REFERENCE CHART

Auto Power Door Locks (UNLOCK Operation)

The driver's MICU control of the door lock actuators is based on inputs from each switch.

INPUT AND OUTPUT REFERENCE CHART

Security Alarm System

The driver's MICU control of the lighting system and horns is based on inputs from each switch and the B-CAN data.

INPUT AND OUTPUT REFERENCE CHART

A/C Pressure Sensor

The driver's MICU sends A/C pressure sensor signal information when the ignition switch is in the IG1 position.

INPUT AND OUTPUT REFERENCE CHART

The passenger's MICU monitors the power supply voltage (back-up voltage). If the voltage goes below 10 V, the passenger's MICU will not store DTCs.

INPUT AND OUTPUT REFERENCE CHART

Courtesy Light (Passenger's Side)

The passenger's MICU control of the front passenger and right rear door courtesy lights is based on inputs from the front passenger and right rear door switch.

INPUT AND OUTPUT REFERENCE CHART

Power Door Locks (LOCK)

The passenger's MICU control of the front passenger's side door lock actuators is based on inputs from the driver's MICU.

INPUT AND OUTPUT REFERENCE CHART

Power Door Locks (UNLOCK)

The passenger's MICU control of the front passenger's side door lock actuators is based on inputs from the driver's MICU.

INPUT AND OUTPUT REFERENCE CHART

Exterior Lights

The passenger's MICU control of the front passenger's side headlight, and parking lights is based on inputs from the driver's MICU.

INPUT AND OUTPUT REFERENCE CHART

Automatic Lighting

The passenger's MICU control of the headlights and the parking lights is based on inputs from the automatic lighting sensor.

INPUT AND OUTPUT REFERENCE CHART

The passenger's MICU control of fog lights is based on inputs from the fog light switch.

INPUT AND OUTPUT REFERENCE CHART

Rear Window Wiper/Washer (Sport Wagon)

The passenger's MICU control of the rear window wiper motor and rear window washer motor is based on input signal from the wiper switch.

INPUT AND OUTPUT REFERENCE CHART

Washer Operation (Sedan)

The passenger's MICU control of the washer motor is based on inputs from the wiper switch.

INPUT AND OUTPUT REFERENCE CHART

Windshield/Rear Window Washer (Sport Wagon)

The passenger's MICU control of the windshield washer and rear window motor is based on IG1 signal.

INPUT AND OUTPUT REFERENCE CHART

Keyless Buzzer Operation

The passenger's MICU control of the keyless buzzer is based on inputs from the answer back signals.

INPUT AND OUTPUT REFERENCE CHART

Passenger's Power Window Relay Circuit

The passenger's MICU control of the power window relay circuit in the passenger's under-dash fuse/relay box is based on inputs from the power window switches.

INPUT AND OUTPUT REFERENCE CHART

HDS Inputs and Function Tests

Certain inputs happen so quickly that the Data List on 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.

HDS INPUTS AND FUNCTION TEST CHART

Function Test

HDS DESCRIPTION CHART

Troubleshooting - B-CAN System Diagnosis Test Mode A

Check the ECM/PCM for DTCs and troubleshoot ECM/PCM (see GENERAL TROUBLESHOOTING INFORMATION ) or F-CAN loss of communication errors first, then do 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 service information.

8

Scheme 63

1. Compare the symptom with this list of B-CAN related systems: Gauge control module Exterior lights Turn signals Entry light control Interior lights Safety indicators Horns (security and panic) Beepers (key-in, seat belt, lights-on, and parking brake) Power window/moonroof timer Wiper/washer Security Keyless entry Power door locks Key interlock Dashlights brightness Immobilizer Daytime running lights Driving position memory system XM radio AcuraLink HandsFreeLink Climate control Power tailgate 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 (DLC) (A), then turn the ignition switch to ON (II).
3. From the BODY ELECTRICAL SYSTEM SELECT menu, select B-CAN CONTROL UNITS INFORMATION, and then select CHECK CONNECTED CONTROL UNITS listed to see if the following control units are communicating with the HDS. Driver's MICU Passenger's MICU Door multiplex control unit (HDS name: Power window unit) Gauge control module Immobilizer-keyless control unit Climate/HVAC control unit HandsFreeLink control unit Power seat control unit (HDS name: Memory seat control unit) AcuraLink control unit (XM receiver) (HDS name: HIP (Honda Information Platform unit)) Power tailgate control unit 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. The HDS only checks the status one time when BODY ELECTRICAL is selected. To recheck the status after repair, reboot the HDS. 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»(/acura/tsx/ii-2008-2014/remont/communication-devices/#multiplex-integrated-control-system-4-cyl__troubleshooting-b-can-system-diagnosis-test) . If all units are not communicating or only the driver's MICU is communicating, go to DTC U1280 troubleshooting (see «DTC U1280: COMMUNICATION BUS LINE ERROR (BUS-OFF)»(/acura/tsx/ii-2008-2014/remont/communication-devices/#multiplex-integrated-control-system-4-cyl__dtc-u1280-communication-bus-line-error) ).
4. Select the system that has the problem from the 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 and the system that is malfunctioning does not stop or turn off, go to «B-CAN SYSTEM DIAGNOSIS TEST MODE C»(/acura/tsx/ii-2008-2014/remont/communication-devices/#multiplex-integrated-control-system-4-cyl__troubleshooting-b-can-system-diagnosis-test) . If the problem is related to one of the following items and the system that is malfunctioning does not run or turn on, go to «B-CAN SYSTEM DIAGNOSIS TEST MODE D»(/acura/tsx/ii-2008-2014/remont/communication-devices/#multiplex-integrated-control-system-4-cyl__troubleshooting-b-can-system-diagnosis-test) . Exterior lights Turn signals Entry light control Interior lights Horns (security and panic) Wiper/washer Power window 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 Beepers (key-in, seat belt, lights-on, and parking brake) Security Keyless entry Key interlock Dashlights brightness Navigation (if equipped) HandsFreeLink Immobilizer Driving position memory system Climate control Power tailgate
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. Signal error DTCs.

Troubleshooting - B-CAN System Diagnosis Test Mode B

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

1. Using the HDS, select the system that has the symptom from the BODY ELECTRICAL SYSTEM SELECT 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 -Faulty driver's MICU; replace the under-dash fuse/relay box, USA models (see «DRIVER'S UNDER-DASH FUSE/RELAY BOX (MICU)REMOVAL AND INSTALLATION»(/acura/tsx/ii-2008-2014/remont/fuses-circuit-breakers/#under-dash-fuserelay-box-4-cyl__drivers-under-dash-fuserelay-box-micu-removal) ), Canada models (see «SPECIAL TOOLS REQUIRED»(/acura/tsx/ii-2008-2014/remont/fuses-circuit-breakers/#under-dash-fuserelay-box-4-cyl__special-tools-required) ).
3. Do the power, ground, and communication part of the input test for the unit(s) not communicating with the HDS. COMMUNICATION PART REFERENCE CHART Unit not communicating Driver's MICU (see «DRIVER'S MICU»(/acura/tsx/ii-2008-2014/remont/communication-devices/#multiplex-integrated-control-system-4-cyl) ) Gauge control module (see «GAUGE CONTROL MODULE INPUT TEST»(/acura/tsx/ii-2008-2014/remont/gauges-instrument-panels/#gauges-4-cyl__gauge-control-module-input-test) ) Immobilizer-keyless control unit (see «IMMOBILIZER-KEYLESS CONTROL UNIT INPUT TEST»(/acura/tsx/ii-2008-2014/remont/door-locks-anti-theft-systems/#immobilizer-system-4-cyl__immobilizer-keyless-control-unit-input-test) ) Passenger's MICU (see «MICU INPUT TEST»(/acura/tsx/ii-2008-2014/remont/communication-devices/#multiplex-integrated-control-system-4-cyl__micu-input-test) ) Door multiplex control unit (see «POWER WINDOW MASTER SWITCH INPUT TEST»(/acura/tsx/ii-2008-2014/remont/windows/#power-windows-4-cyl__power-window-master-switch-input-test) ) Climate control unit (see «CLIMATE CONTROL POWER AND GROUND CIRCUIT TROUBLESHOOTING»(/acura/tsx/ii-2008-2014/remont/automatic-hvac-system/#climate-control-4-cyl) ) Audio-navigation unit (see «NAVIGATION UNIT CONNECTOR FOR INPUTS AND OUTPUTS»(/acura/tsx/ii-2008-2014/remont/entertainment-systems/#navigation-system-4-cyl__navigation-unit-connector-for-inputs-and) ) Navigation display unit (see «NAVIGATION DISPLAY UNIT CONNECTOR FOR INPUTS AND OUTPUTS»(/acura/tsx/ii-2008-2014/remont/entertainment-systems/#navigation-system-4-cyl) ) Power seat control unit (see «POWER SEAT CONTROL UNIT INPUT TEST/REPLACEMENT»(/acura/tsx/ii-2008-2014/remont/seats/#driver-position-memory-system-dpms-4-cyl__power-seat-control-unit-input-testreplacement) ) AcuraLink control unit (see «MESSAGE DELETE PROCEDURE»(/acura/tsx/ii-2008-2014/remont/entertainment-systems/#acuralink-4-cyl) ) HandsFreeLink control unit (see «SYSTEM DESCRIPTION»(/acura/tsx/ii-2008-2014/remont/entertainment-systems/#handsfreelink-system-4-cyl) ) Power tailgate control unit (see «CONTROL UNIT INPUT TEST/REPLACEMENT»(/acura/tsx/ii-2008-2014/remont/exterior-body-panels/#power-tailgate-4-cyl) )

Troubleshooting - B-CAN System Diagnosis Test Mode C

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

Note. If the component does not turn on, go to B-CAN SYSTEM DIAGNOSIS TEST MODE D . Seethe B-CAN system unit input/output index for a list of input and output devices and the control units that monitor the input and control the output devices (see HDS INPUTS AND FUNCTION TESTS ).

1. Check for DTCs by selecting the MODE MENU from the HDS. Are any DTCs indicated? YES -Go to «B-CAN SYSTEM DIAGNOSIS TEST MODE A»(/acura/tsx/ii-2008-2014/remont/communication-devices/#multiplex-integrated-control-system-4-cyl__troubleshooting-b-can-system-diagnosis-test) . NO -Go to step 2.
2. Turn off the switch that controls the malfunctioning component.
3. Select the applicable system from the system MODE MENU, then select DATA LIST, and check the input of the switch that controls the related 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 that does not stop or turn off, 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 stop or turn OFF. NO -Replace the relay, or repair/replace 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/replace the wire harness.

Troubleshooting - B-CAN System Diagnosis Test Mode D

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

Note. If the component does not turn off or stop, go to B-CAN SYSTEM DIAGNOSIS TEST MODE C . See the B-CAN system unit input/output index for a list of input and output devices and the control units that monitor the input and control the output devices (see HDS INPUTS AND FUNCTION TESTS ).

1. Check the fuse of the malfunctioning output device. Is the fuse OK? YES -Go to step 2. NO -Replace the fuse. If the fuse blows again, repair the short to ground on the fuse circuit of the malfunctioning device.
2. Check for DTCs by selecting the system MODE MENU from the HDS. Are any DTCs indicated? YES -Go to «B-CAN SYSTEM DIAGNOSIS TEST MODE A»(/acura/tsx/ii-2008-2014/remont/communication-devices/#multiplex-integrated-control-system-4-cyl__troubleshooting-b-can-system-diagnosis-test) . NO -Go to step 3.
3. Turn ON the switch that controls the malfunctioning component.
4. Select the applicable system from the system MODE MENU, then select DATA LIST, and check the input of the switch that controls the related 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. Is the relay and the circuit OK? YES -Go to step 6. NO -Replace the relay or repair the wire circuit.
6. Do the function test for the malfunctioning component. Does the output device pass the function test? YES -Go to step 7. NO -Replace the component.
7. With the malfunctioning output device connected, connect a voltmeter between the malfunctioning output device and body ground on the wire that the control unit uses to control the output device circuit.
8. Select FUNCTIONAL. TEST from the system MODE MENU, and do the forced operation test of the malfunctioning component. Is there a change in voltage (12 V to 0 V or 0 V to 12 V)? YES -Inspect the ground for the component. If OK, replace the component. NO -Replace the control unit that controls the malfunctioning component.
9. Select DATA LIST from the 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. Is the switch and the wire harness OK? YES -Replace the control unit that monitors the switch. NO -Replace the switch, or repair/replace 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 ECM/PCM for DTCs and troubleshoot ECM/PCM (see GENERAL TROUBLESHOOTING INFORMATION ) or F-CAN loss of communication errors first, then do this diagnosis if the HDS is not available.

Scheme 64

1. Check the No. 15 (10 A) fuse in the under-hood fuse/relay box and No. 5 (7.5 A) fuse in the driver's under-dash fuse/relay box. Are the fuses OK? YES -Go to step 2. NO -Replace the fuse. If the fuse blows again, repair the short to ground on the fuse circuit.
2. Remove the driver's dashboard lower cover (see «DRIVER'S DASHBOARD LOWER COVER REMOVAL/INSTALLATION»(/acura/tsx/ii-2008-2014/remont/gauges-instrument-panels/#dashboard-4-cyl__drivers-dashboard-lower-cover-removalinstallation) ).
3. Turn the ignition switch to 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 driver's 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 multi-information display (MID) on the gauge control module while still in Test Mode 1. Push the odometer SEL/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 (see «USING THE B-CAN SYSTEM DIAGNOSIS TEST MODE 1 (USE ONLY IF THE HDS IS UNAVAILABLE)»(/acura/tsx/ii-2008-2014/remont/communication-devices/#multiplex-integrated-control-system-4-cyl__using-the-b-can-system-diagnosis-test) ). Are any DTCs indicated? YES -Go to step 7. NO -Go to step 9 .
7. Record all DTCs and troubleshoot them in this order: Battery voltage DTCs Internal error DTCs Loss of communication DTCs Signal error DTCs
8. Clear the DTCs by pressing and holding the SEL/RESET button for about 10 seconds.
9. You will hear a beep to confirm the codes have been cleared. Operate the devices that failed, and recheck for codes. Test Mode 2
10. Remove the MPCS service connector from the driver's under-dash fuse/relay box MICU service check connector socket for 5-10 seconds, then re-insert it to enter Mode 2. When the system enters Mode 2, the ceiling light flashes two times quickly and then goes off. NOTE: If the MPCS service connector is disconnected for too short or too long of a time, or the ignition switch is turned to LOCK (0), the system returns 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. Driver's MICU DRIVER'S MICU REFERENCE CHART Item Brake pedal position switch (ON) Driver's door switch Left rear door switch Trunk lid latch switch Tailgate latch switch Fog light switch Left rear door lock knob switch (UNLOCK) Wiper switch (HI/LO) Wiper switch (INT/LO) Wiper switch (MIST) Washer switch Wiper intermittent dwell time controller Turn signal switch (LEFT) Turn signal switch (RIGHT) Hazard warning switch (ON) Headlight switch (AUTO) Headlight switch (ON) Headlight switch (OFF) Lighting switch (ON) Dimmer switch (ON) Passing switch (ON) Trunk lid opener main switch Trunk lid outer handle switch A/C pressure sensor Transmission range switch (P) (A/T) Ignition key switch Security hood switch Back-up light switch Wiper motor park position (Auto stop) Passenger's MICU PASSENGER'S MICU REFERENCE CHART Item Front passenger's door switch Right rear door switch Right rear door lock knob switch (UNLOCK) Audio unit Door Multiplex Control Unit DOOR MULTIPLEX CONTROL UNIT REFERENCE CHART 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) (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. Front Passenger's Power Window Switch FRONT PASSENGER'S POWER WINDOW SWITCH REFERENCE CHART Item Front passenger's door lock switch (UNLOCK) Front passenger's door lock switch (LOCK) Front passenger's door lock knob switch (UNLOCK) Power Seat Control Unit POWER SEAT CONTROL UNIT REFERENCE CHART Item Transmission range switch (P) (A/T) Parking brake switch (M/T) Slide switch (Forward) Slide switch (Backward) Recline switch (Forward) Recline switch (Backward) Front UP-DOWN switch (Up) Front UP-DOWN switch (Down) Rear UP-DOWN switch (Up) Rear UP-DOWN switch (Down) 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: Close all doors. Turn the ignition switch to LOCK (0), 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 50 seconds. IG1 power supply IG2 power supply B-CAN data Trunk lid latch switch (Trunk lid closed) (OFF) Tailgate latch switch (Tailgate closed) (OFF) Hazard warning switch (OFF)
2. Confirm the sleep mode: NOTE: Check any official Honda service website for more service information about parasitic draw at the battery. 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 in less than 50 seconds.
3. Shift to the wake up mode: When the ignition switch is turned to ON (II), the driver's MICU, passenger's MICU, gauge control module, immobilizer-keyless control unit, and ECM/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 is a list of the switches and the input signals that wake them up. IG1 power supply IG2 power supply B-CAN data Driver's door switch (door open) Left rear door switch (door open) Trunk lid latch switch (Trunk lid open) Tailgate latch switch (Tailgate open) Tailgate outer handle switch (Tailgate open) Left rear door lock knob switch Security hood switch (hood open) Hazard warning switch (ON) Combination light switch (Parking, Headlight, Dimmer, Passing ON) Ignition key switch (key inserted) Trunk lid opener main switch (ON) Driver's door key cylinder switch (LOCK/UNLOCK) Passenger's rear door lock knob (UNLOCK) Front passenger's door lock knob (UNLOCK) Driver's door lock switch (LOCK/UNLOCK) Front passenger's door lock switch (LOCK/UNLOCK) Front passenger's door switch (door open) Passenger's rear door switch (door open) Trunk release switch (ON)

Scheme 65

Scheme 66

DTC B10A2: Driver's MICU (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 to ON (II).
3. Check for DTCs with the HDS. Is DTC B10A2 indicated? YES -Faulty driver's MICU; replace the driver's under-dash fuse/relay box, USA models (see «DRIVER'S UNDER-DASH FUSE/RELAY BOX (MICU)REMOVAL AND INSTALLATION»(/acura/tsx/ii-2008-2014/remont/fuses-circuit-breakers/#under-dash-fuserelay-box-4-cyl__drivers-under-dash-fuserelay-box-micu-removal) ), Canada models (see «SPECIAL TOOLS REQUIRED»(/acura/tsx/ii-2008-2014/remont/fuses-circuit-breakers/#under-dash-fuserelay-box-4-cyl__special-tools-required) ). NO -Intermittent failure, the system is OK at this time.

DTC B11A2: Passenger's MICU (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 to ON (II).
3. Check for DTCs with the HDS. Is DTC B11A2 indicated? YES -Faulty passenger's MICU; replace the passenger's under-dash fuse/relay box (see «INSTALLATION»(/acura/tsx/ii-2008-2014/remont/fuses-circuit-breakers/#under-dash-fuserelay-box-4-cyl) ). NO -Intermittent failure, the system is OK at this time.

DTC B1036: Driver's MICU 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 ). Before troubleshooting, make sure the No. 5 (7.5 A) fuse in the driver's under-dash fuse/relay box is OK.

Scheme 67

1. Clear the DTCs with the HDS.
2. Turn the ignition switch to LOCK (0), and then back to ON (II).
3. Wait for at least 6 seconds.
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 connections at the driver's under-dash fuse/relay box connector C (5P). If the connections are good, check the battery condition (see «BATTERY TEST»(/acura/tsx/ii-2008-2014/remont/body-electrical/#battery-4-cyl__battery-test) ) and the charging system.
5. Measure the voltage between gauge control module 32P connector terminals No. 15 and body ground. GAUGE CONTROL MODULE 32P CONNECTOR Is there battery voltage? YES -Faulty driver's MICU; replace the driver's under-dash fuse/relay box, USA models (see «DRIVER'S UNDER-DASH FUSE/RELAY BOX (MICU)REMOVAL AND INSTALLATION»(/acura/tsx/ii-2008-2014/remont/fuses-circuit-breakers/#under-dash-fuserelay-box-4-cyl__drivers-under-dash-fuserelay-box-micu-removal) ), Canada models (see «SPECIAL TOOLS REQUIRED»(/acura/tsx/ii-2008-2014/remont/fuses-circuit-breakers/#under-dash-fuserelay-box-4-cyl__special-tools-required) ). NO -Repair an open in the wire between the driver's under-dash fuse/relay box and the gauge control module.

DTC B11C7: Passenger's MICU 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 ). Before troubleshooting, make sure the No. 5 (7.5 A) fuse in the driver's under-dash fuse/relay box is OK.

Scheme 68

1. Clear the DTCs with the HDS.
2. Turn the ignition switch to LOCK (0), and then back to ON (II).
3. Wait for at least 6 seconds or more.
4. Check for DTCs with the HDS. Is DTC B11C7 indicated? YES -Go to step 5. NO -Intermittent failure, the system is OK at this time. Check for loose or poor connections. If the connections are good, check the battery condition (see «BATTERY TEST»(/acura/tsx/ii-2008-2014/remont/body-electrical/#battery-4-cyl__battery-test) ) and the charging system.
5. Check the DTCs with the HDS. Is DTC B11C7 indicated with DTC U1282? YES -Go to «DTC U1282 TROUBLESHOOTING»(/acura/tsx/ii-2008-2014/remont/communication-devices/#multiplex-integrated-control-system-4-cyl__dtc-u1282-passengers-micu-lost-communication) . NO -Go to step 6.
6. Turn the ignition switch to LOCK (0).
7. Turn the ignition switch to ON (II).
8. Measure the voltage between passenger's under-dash fuse/relay box connector A (38P) terminal No. 35 and body ground. PASSENGER'S UNDER-DASH FUSE/RELAY BOX CONNECTOR A (38P) Is there battery voltage? YES -Faulty passenger's MICU; replace the passenger's under-dash fuse/relay box (see «INSTALLATION»(/acura/tsx/ii-2008-2014/remont/fuses-circuit-breakers/#under-dash-fuserelay-box-4-cyl) ). NO -Repair an open in the wire between the passenger's under-dash fuse/relay box and the driver's under-dash fuse/relay box. B

DTC U0155: Driver's MICU Lost Communication With Gauge Control Module

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 69

Scheme 70

Scheme 71

1. Clear the DTCs with the HDS.
2. Turn the ignition switch to LOCK (0), and then back to ON (II).
3. Wait for at least 6 seconds.
4. Check for DTCs with the HDS. Is DTC U0155 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 MICU and the gauge control module.
5. Measure the voltage between body ground and gauge control module 32P connector terminals No. 15 and No. 16 individually. GAUGE CONTROL MODULE 32P CONNECTOR Is there battery voltage? YES -Go to step 8 . NO -Go to step 6.
6. Turn ignition switch to LOCK (0).
7. Check the No. 15 (10 A) fuse in the under-hood fuse/relay box and the No. 5 (7.5 A) fuse in the driver's under-dash fuse/relay box. Are the fuses OK? YES -Repair an open or high resistance in the No. 15 (10 A) and/or No. 5 (7.5 A) fuse circuit. NO -Replace the fuse(s). If the fuse blows again, repair a short to ground in the No. 15 (10 A) and/or No. 5 (7.5 A) fuse circuit.
8. Measure the voltage between body ground and gauge control module 32P connector terminals No. 1 and No. 17 individually. GAUGE CONTROL MODULE 32P CONNECTOR Is there less than 0.2 V? YES -Go to step 9. NO -Repair an open or high resistance in the ground wire or poor ground (G501) and/or (G502).
9. Turn the ignition switch to LOCK (0).
10. Disconnect driver's under-dash fuse/relay box connector P (20P).
11. Disconnect the gauge control module 32P connector.
12. Check for continuity between gauge control module 32P connector terminals No. 23 and No. 24 and driver's under-dash fuse/relay box connector P (20P) terminals No. 5 and No. 6 respectively. GAUGE CONTROL MODULE 32P CONNECTOR Wire side of female terminals Is there continuity? YES -Replace the gauge control module (see «GAUGE CONTROL MODULE REPLACEMENT»(/acura/tsx/ii-2008-2014/remont/gauges-instrument-panels/#gauges-4-cyl__gauge-control-module-replacement) ). NO -Repair an open or poor connection in the B-CAN wife between the driver's MICU and the gauge control module.

DTC U0155: Passenger's MICU Lost Communication With Gauge Control Module

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 72

Scheme 73

Scheme 74

1. Clear the DTCs with the HDS.
2. Turn the ignition switch to LOCK (0), and then back to ON (II).
3. Wait for at least 6 seconds.
4. Check for DTCs with the HDS. Is DTC U0155 indicated? YES -Go to step 5. NO -Intermittent failure, the system is OK at this time. Check for loose or poor connections between the passenger's MICU and the gauge control module.
5. From the BODY ELECTRICAL SYSTEM SELECT menu, select B-CAN CONTROL UNITS INFORMATION, and then select CHECK CONNECTED CONTROL UNITS. Is the gauge control module detected? YES -Go to step 9. NO -Go to step 6.
6. Measure the voltage between body ground and gauge control module 32P connector terminals No. 15 and No. 16 individually. GAUGE CONTROL MODULE 32P CONNECTOR Is there battery voltage? YES -Go to step 9 . NO -Go to step 7.
7. Turn the ignition switch to LOCK (0).
8. Check the No. 15 (10 A) fuse in the under-hood fuse/relay box and the No. 5 (7.5 A) fuse in the driver's under-dash fuse/relay box. Are the fuses OK? YES -Repair an open or high resistance in the No. 15 (10 A) and/or No. 5 (7.5 A) fuse circuit. NO -Replace the fuse(s). If the fuse blows again, repair a short to ground in the No. 15 (10 A) and/or No. 5 (7.5 A) fuse circuit.
9. Measure the voltage between body ground and gauge control module 32P connector terminals No. 1 and No. 17 individually. Is there less than 0.2 V? YES -Go to step 10. NO -Repair an open or high resistance in the ground wire or poor ground (G501) and/or (G502).
10. Turn the ignition switch to LOCK (0).
11. Disconnect passenger's under-dash fuse/relay box connector A (38P).
12. Disconnect the gauge control module 32P connector.
13. Check for continuity between gauge control module 32P connector terminals No. 23 and No. 24 and passenger's under-dash fuse/relay box connector A (38P) terminals No. 29 and No. 11 respectively. GAUGE CONTROL MODULE 32P CONNECTOR Wire side of female terminals Is there continuity? YES -Replace the gauge control module (see «GAUGE CONTROL MODULE REPLACEMENT»(/acura/tsx/ii-2008-2014/remont/gauges-instrument-panels/#gauges-4-cyl__gauge-control-module-replacement) ). NO -Repair an open or poor connection in the B-CAN wire between the passenger's MICU and the gauge control module.

DTC U0199: Driver's MICU Lost Communication With Door Multiplex Control Unit

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 75

Scheme 76

Scheme 77

1. Clear the DTCs with the HDS.
2. Turn the ignition switch to LOCK (0), and then back to ON (II).
3. Wait for at least 6 seconds.
4. Check for DTCs with the HDS. Is DTC U0199 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 MICU and the door multiplex control unit.
5. Measure the voltage between body ground and power window master switch 37P connector terminal No. 13. POWER WINDOW MASTER SWITCH 37P CONNECTOR Is there battery voltage? YES -Go to step 7 . NO -Go to step 6.
6. Check the No. 15 (10 A) fuse in the under-hood fuse/relay box. Is the fuse OK? YES -Repair an open or high resistance in the No. 15 (10 A) fuse circuit. NO -Replace the fuse. If the fuse blows again, repair a short to ground in the No. 15(10 A) fuse circuit.
7. Measure the voltage between body ground and power window master switch 37P connector terminals No. 32 and No. 37 individually. POWER WINDOW MASTER SWITCH 37P CONNECTOR Is there less than 0.2 V? YES -Go to step 8. NO -Repair an open or high resistance in the ground wire or poor ground (G501) and/or (G502).
8. Turn the ignition switch to LOCK (0).
9. Disconnect driver's under-dash fuse/relay box connector P (20P).
10. Disconnect the power window master switch 37P connector.
11. Check for continuity between power window master switch 37P connector terminals No. 33 and No. 35 and driver's under-dash fuse/relay box connector P (20P) terminals No. 5 and No. 6 respectively. POWER WINDOW MASTER SWITCH 37P CONNECTOR Wire side of female terminals Is there continuity? YES -Replace the power window master switch (see «POWER WINDOW MASTER SWITCH REPLACEMENT»(/acura/tsx/ii-2008-2014/remont/windows/#power-windows-4-cyl) ). NO -Repair an open or poor connection in the B-CAN wire between the driver's MICU and the door multiplex control unit.

DTC U1280: 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 78

Scheme 79

Scheme 80

1. Clear the DTCs with the HDS.
2. Turn the ignition switch to LOCK (0), and then back to ON (II).
3. Wait for at least 6 seconds.
4. Check for DTCs with the HDS. Is DTC U1280 indicated? YES -Go to step 5. NO -Intermittent failure, the system 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/tsx/ii-2008-2014/remont/body-electrical/#battery-4-cyl__battery-test) ) and the charging system.
5. Turn the ignition switch to LOCK (0).
6. 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 REFERENCE CHART Control Unit Connector Passenger's MICU Passenger's under-dash fuse/relay box connector A (38P) Door multiplex control unit Power window master switch 37P connector Gauge control module 32P connector Immobilizer-keyless control unit 7P connector Audio unit (5) Connector B (20P) Climate control unit Connector B (12P) Power seat control unit (1) 40P connector HandsFreeLink control unit 28P connector AcuraLink control unit (2) Connector A (32P) Audio-navigation unit (3) Connector D (20P) Navigation display unit (3) 28P connector Power tailgate control unit (4) Connector C (14P) (1) With DPMS (2) With AcuraLink (3) With navigation (4) With power tailgate (5) Without navigation Is DTC U1280 indicated with each individual unit disconnected? YES -Leave the connectors disconnected, and go to step 7. NO -Go to the input test (or circuit troubleshooting) for the control unit that was disconnected when DTC U1280 did not reset and perform all power and ground input tests. If the tests prove OK, replace that unit. Passenger's MICU input test (see «MICU INPUT TEST»(/acura/tsx/ii-2008-2014/remont/communication-devices/#multiplex-integrated-control-system-4-cyl__micu-input-test) ) Door multiplex control unit input test (see «POWER WINDOW MASTER SWITCH INPUT TEST»(/acura/tsx/ii-2008-2014/remont/windows/#power-windows-4-cyl__power-window-master-switch-input-test) ) Gauge control unit input test (see «GAUGE CONTROL MODULE INPUT TEST»(/acura/tsx/ii-2008-2014/remont/gauges-instrument-panels/#gauges-4-cyl__gauge-control-module-input-test) ) Immobilizer-keyless control unit input test (see «IMMOBILIZER-KEYLESS CONTROL UNIT INPUT TEST»(/acura/tsx/ii-2008-2014/remont/door-locks-anti-theft-systems/#immobilizer-system-4-cyl__immobilizer-keyless-control-unit-input-test) ) Climate control unit power and ground circuit troubleshooting (see «CLIMATE CONTROL POWER AND GROUND CIRCUIT TROUBLESHOOTING»(/acura/tsx/ii-2008-2014/remont/automatic-hvac-system/#climate-control-4-cyl) ) Power seat control unit input test (see «POWER SEAT CONTROL UNIT INPUT TEST/REPLACEMENT»(/acura/tsx/ii-2008-2014/remont/seats/#driver-position-memory-system-dpms-4-cyl__power-seat-control-unit-input-testreplacement) ) HandsFreeLink control unit input test (see «CONTROL UNIT INPUT TEST»(/acura/tsx/ii-2008-2014/remont/entertainment-systems/#handsfreelink-system-4-cyl) ) AcuraLink control unit input test (see «MESSAGE DELETE PROCEDURE»(/acura/tsx/ii-2008-2014/remont/entertainment-systems/#acuralink-4-cyl) ) Audio unit input test (see «AUDIO UNIT CONNECTOR FOR INPUTS AND OUTPUTS (WITH ELS AUDIO)»(/acura/tsx/ii-2008-2014/remont/entertainment-systems/#audio-system-4-cyl__audio-unit-connector-for-inputs-and) ) Audio-navigation unit input test (see «AUDIO-NAVIGATION SWITCH PANEL FOR INPUTS AND OUTPUTS (WITH ELS AUDIO)»(/acura/tsx/ii-2008-2014/remont/entertainment-systems/#audio-system-4-cyl) ) Navigation display unit input test (see «NAVIGATION UNIT CONNECTOR FOR INPUTS AND OUTPUTS»(/acura/tsx/ii-2008-2014/remont/entertainment-systems/#navigation-system-4-cyl__navigation-unit-connector-for-inputs-and) ) Power tailgate control unit input test (see «CONTROL UNIT INPUT TEST/REPLACEMENT»(/acura/tsx/ii-2008-2014/remont/exterior-body-panels/#power-tailgate-4-cyl) )
7. Turn the ignition switch to LOCK (0).
8. Disconnect driver's under-dash fuse/relay box connector P (20P).
9. Check for continuity between driver's under-dash fuse/relay box connector P (20P) terminals No. 5 and No. 6. DRIVER'S UNDER-DASH FUSE/RELAY BOX CONNECTOR P (20P) Is there continuity? YES -Repair a short in the B-CAN wires. NO -Go to step 10.
10. Check for continuity between body ground and driver's under-dash fuse/relay box connector P (20P) terminals No. 5 and No. 6 individually. DRIVER'S UNDER-DASH FUSE/RELAY BOX CONNECTOR P (20P) Is there continuity? YES -Repair a short to ground in the wire(s). NO -Go to step 11.
11. Turn the ignition switch to ON (II).
12. Measure the voltage between body ground and driver's under-dash fuse/relay box connector P (20P) terminals No. 5 and No. 6 individually. DRIVER'S UNDER-DASH FUSE/RELAY BOX CONNECTOR P (20P) Is there voltage? YES -Repair a short to power in the wire(s). NO -Faulty driver's MICU, replace the driver's under-dash fuse/relay box, USA models (see «DRIVER'S UNDER-DASH FUSE/RELAY BOX (MICU)REMOVAL AND INSTALLATION»(/acura/tsx/ii-2008-2014/remont/fuses-circuit-breakers/#under-dash-fuserelay-box-4-cyl__drivers-under-dash-fuserelay-box-micu-removal) ), Canada models (see «SPECIAL TOOLS REQUIRED»(/acura/tsx/ii-2008-2014/remont/fuses-circuit-breakers/#under-dash-fuserelay-box-4-cyl__special-tools-required) ).

DTC U1282: Passenger's MICU Lost Communication With Driver's MICU

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 to ON (II).
3. Wait for at least 6 seconds.
4. Check for DTCs with the HDS. Is DTC U1282 indicated? YES -Faulty passenger's MICU; replace the passenger's under-dash fuse/relay box (see «INSTALLATION»(/acura/tsx/ii-2008-2014/remont/fuses-circuit-breakers/#under-dash-fuserelay-box-4-cyl) ). NO -Intermittent failure, the system is OK at this time. Check for loose or poor connections between the Passenger's MICU and the driver's MICU.

DTC U1283: Driver's MICU Lost Communication With Passenger's MICU

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 81

Scheme 82

Scheme 83

Scheme 84

1. Clear the DTCs with the H DS.
2. Turn the ignition switch to LOCK (0), and then back to ON (II).
3. Wait for at least 6 seconds.
4. Check for DTCs with the HDS. Is DTC U1283 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 MICU and the passenger's MICU.
5. Measure the voltage between body ground and passenger's under-dash fuse/relay box connector A (38P) terminals No. 14 and No. 35 individually. PASSENGER'S UNDER-DASH FUSE/RELAY BOX CONNECTOR A (38P) Is there battery voltage? YES -Go to step 7 . NO -Go to step 6.
6. Check the No. 15(10 A) fuse in the under-hood fuse/relay box and the No. 5 (7.5 A) fuse in the driver's under-dash fuse/relay box. Are the fuses OK? YES -Repair an open or high resistance in the No. 15 (10 A) and/or No. 5 (7.5 A) fuse circuit. NO -Replace the fuse(s). If the fuse blows again, repair a short to ground in the No. 15 (10 A) and/or No. 5 (7.5 A) fuse circuit.
7. Measure the voltage between body ground and passenger's under-dash fuse/relay box connector A (38P) and E (18P) terminals as shown. TERMINAL VOLTAGE REFERENCE CHART Passenger's under-dash fuse/relay box connector A36 Body ground A37 E15 E16 PASSENGERS UNDER-DASH FUSE/RELAY BOX CONNECTOR A (38P) PASSENGERS UNDER-DASH FUSE/RELAY BOX CONNECTOR E (18P) Is there less than 0.2 V? YES -Go to step 8. NO -Repair an open or high resistance in the ground wire or poor ground (G201) and/or (G505).
8. Turn the ignition switch to LOCK (0).
9. Disconnect passenger's under-dash fuse/relay box connector A (38P).
10. Disconnect driver's under-dash fuse/relay box connector P (20P).
11. Check for continuity between passenger's under-dash fuse/relay box connector A (38P) terminals No. 11 and No. 29 and driver's under-dash fuse/relay box connector P (20P) terminals No. 6 and No. 5 respectively. PASSENGER'S UNDER-DASH FUSE/RELAY BOX CONNECTOR A (38P) Wire side of female terminals Is there continuity? YES -Faulty driver's MICU; replace the driver's under-dash fuse/relay box, USA models (see «DRIVER'S UNDER-DASH FUSE/RELAY BOX (MICU)REMOVAL AND INSTALLATION»(/acura/tsx/ii-2008-2014/remont/fuses-circuit-breakers/#under-dash-fuserelay-box-4-cyl__drivers-under-dash-fuserelay-box-micu-removal) ), Canada models (see «SPECIAL TOOLS REQUIRED»(/acura/tsx/ii-2008-2014/remont/fuses-circuit-breakers/#under-dash-fuserelay-box-4-cyl__special-tools-required) ). NO -Repair an open or poor connection in the B-CAN wire between the driver's MICU and the passenger's MICU.

MICU Input Test

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

Scheme 85

Scheme 86

1. Turn the ignition switch to LOCK (0).
2. Remove the driver's dashboard undercover (see «DRIVER'S DASHBOARD UNDERCOVER REMOVAL/INSTALLATION»(/acura/tsx/ii-2008-2014/remont/gauges-instrument-panels/#dashboard-4-cyl__drivers-dashboard-undercover-removalinstallation) ), then remove the dashboard lower cover (see «DRIVER'S DASHBOARD LOWER COVER REMOVAL/INSTALLATION»(/acura/tsx/ii-2008-2014/remont/gauges-instrument-panels/#dashboard-4-cyl__drivers-dashboard-lower-cover-removalinstallation) ).
3. Disconnect driver's under-dash fuse/relay box connectors N, P, Q, and R. NOTE: All connector views are wire side of female terminals.
4. Inspect the connector and socket terminals to make 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, do the following input test: 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. TEST CONDITION CHART Cavity Wire Test condition Test: Desired result Possible cause if desired result is not obtained P5 BLU Immobilizer-keyless control unit 7P connector disconnected Check for continuity between terminal P5 and the immobilizer-keyless control unit 7P connector terminal No. 3: There should be continuity. An open in the B-CAN wire P6 PNK Check for continuity between terminal P6 and the immobilizer-keyless control unit 7P connector terminal No. 4: There should be continuity. An open in the B-CAN wire P5 BLU Gauge control module 32P connector disconnected Check for continuity between terminal P5 and the gauge control module 32P connector terminal No. 23: There should be continuity. An open in the B-CAN wire P6 PNK Check for continuity between terminal P6 and the gauge control module 32P connector terminal No. 24: There should be continuity. An open in the B-CAN wire P5 BLU Power window master switch 37P connector disconnected Check for continuity between terminal P5 and the power window master switch 37P connector terminal No. 33: There should be continuity. An open in the B-CAN wire P6 PNK Check for continuity between terminal P6 and the power window master switch 37P connector terminal No. 35: There should be continuity. An open in the B-CAN wire P5 BLU Passenger's under-dash fuse/relay box connector A (38P) disconnected Check for continuity between terminal P5 and the passenger's under-dash fuse/relay box connector A (38P) terminal No. 29: There should be continuity. An open in the B-CAN wire P6 PNK Check for continuity between terminal P6 and the passenger's under-dash fuse/relay box connector A (38P) terminal No. 11: There should be continuity. An open in the B-CAN wire P5 BLU Climate control unit connector B (12P) disconnected Check for continuity between terminal P5 and the climate control unit connector B (12P) terminal No. 2: There should be continuity. An open in the B-CAN wire P6 PNK Check for continuity between terminal P6 and the climate control unit connector B (12P) terminal No. 1: There should be continuity. An open in the B-CAN wire P5 BLU Audio unit connector B (20P) (5) disconnected Check for continuity between terminal P5 and the audio unit connector B (20P) terminal No. 8: There should be continuity. An open in the B-CAN wire P6 PNK Check for continuity between terminal P6 and the audio unit connector B (20P) terminal No. 18: There should be continuity. An open in the B-CAN wire P5 BLU Audio-navigation unit connector D (20P) disconnected (3) Check for continuity between terminal P5 and the audio-navigation unit connector D (20P) terminal No. 15: There should be continuity. An open in the B-CAN wire P6 PNK Check for continuity between terminal P6 and the audio-navigation unit connector D (20P) terminal No. 6: There should be continuity. An open in the B-CAN wire P5 BLU Power tailgate control unit connector C (14P) disconnected (4) Check for continuity between terminal P5 and the power tailgate control unit connector C (14P) terminal No. 6: There should be continuity. An open in the B-CAN wire P6 PNK Check for continuity between terminal P6 and the power tailgate control unit connector C (14P) terminal No. 7: There should be continuity. An open in the B-CAN wire P5 BLU Power seat control unit connector A (40P) (1) disconnected Check for continuity between terminal P5 and the power seat control unit connector A (40P) terminal No. 39: There should be continuity. An open in the B-CAN wire P6 PNK Check for continuity between terminal P6 and the power seat control unit connect A (40P) terminal No. 40: There should be continuity. An open in the B-CAN wire P5 BLU HandsFreeLink control unit 28P connector disconnected Check for continuity between terminal P5 and the HandsFreeLink control unit 28P connector terminal No. 17: There should be continuity. An open in the B-CAN wire P6 PNK Check for continuity between terminal P6 and the HandsFreeLink control unit 28P connector terminal No. 18: There should be continuity. An open in the B-CAN wire P5 BLU AcuraLink control unit 32P connector (2) disconnected Check for continuity between terminal P5 and the AcuraLink control unit 32P connector terminal No. 8: There should be continuity. An open in the B-CAN wire P6 PNK Check for continuity between terminal P6 and the AcuraLink control unit 32P connector terminal No. 9: There should be continuity. An open in the B-CAN wire P5 BLU Navigation display unit 28P connector disconnected (3) Check for continuity between terminal P5 and the navigation display unit 28P connector terminal No. 8: There should be continuity. An open in the B-CAN wire P6 PNK Check for continuity between terminal P6 and the navigation display unit 28P connector terminal No. 9: There should be continuity. An open in the B-CAN wire Q16 LT BLU Under all conditions Check for continuity between terminal Q16 and the data link connector (DLC) 16P terminal No. 7: There should be continuity. An open in the B-CAN wire (1) With DPMS (2) With AcuraLink (3) With navigation (4) With power tailgate (5) Without navigation
6. Reconnect the connectors to the driver's under-dash fuse/relay box, turn the ignition switch to ON (II), and do the following input tests: 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 7. NOTE: These are power and ground tests for the multiplex integrated control unit. TEST CONDITION CHART Cavity Wire Test condition Test: Desired result Possible cause if desired result is not obtained P9 WHT Under all conditions Measure the voltage to ground: There should be battery voltage. Blown No. 15(10 A) fuse in the under-hood fuse/relay box Faulty driver's under-dash fuse/relay box An open or high resistance in the wire P20 BRN Ignition switch ON (II) Measure the voltage to ground: There should be battery voltage. Blown No. 5 (7.5 A) fuse in the driver's under- dash fuse/relay box Faulty driver's under-dash fuse/relay box An open or high resistance in the wire N12 BRN Under all conditions Measure the voltage to ground: There should be less than 0.2 V. Poor ground (G501) An open or high resistance in the ground wire Q1 BLK Under all conditions Measure the voltage to ground: There should be less than 0.2 V. Poor ground (G502) An open or high resistance in the ground wire Q2 BRN Under all conditions Measure the voltage to ground: There should be less than 0.2 V. Poor ground (G501) An open or high resistance in the ground wire R2 BRN Under all conditions Measure the voltage to ground: There should be less than 0.2 V. Poor ground (G501) An open or high resistance in the ground wire R5 BLK Under all conditions Measure the voltage to ground: There should be less than 0.2 V. Poor ground (G502) An open or high resistance in the ground wire Passenger's MICU
7. Turn the ignition switch to LOCK (0), and remove the passenger's kick panel (see «TRIM REMOVAL/INSTALLATION - DOOR AREAS»(/acura/tsx/ii-2008-2014/remont/exteriorinterior-trim/#interior-trim-4-cyl__trim-removalinstallation-door-areas) ).
8. Disconnect passenger's under-dash fuse/relay box connectors A and E. NOTE: All connector views are wire side of female terminals.
9. Inspect the connector and socket terminals to make 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 10.
10. Reconnect the connectors to the passenger's under-dash fuse/relay box, turn the ignition switch to ON (II), and do the following input tests: 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 11. TEST CONDITION CHART Cavity Wire Test condition Test: Desired result Possible cause if desired result is not obtained A14 WHT Under all conditions Measure the voltage to ground: There should be battery voltage. Blown No. 15 (10 A) fuse in the under-hood fuse/relay box Faulty driver's under-dash fuse/relay box An open or high resistance in the wire A35 BRN Ignition switch ON (II) Measure the voltage to ground: There should be battery voltage. Blown No. 5 (7.5 A) fuse in the driver's under-dash fuse/relay box Faulty driver's under-dash fuse/relay box An open or high resistance in the wire A36 BLK Under all conditions Measure the voltage to ground: There should be less than 0.2 V. Poor ground (G505) An open or high resistance in the ground wire A37 BLK Under all conditions Measure the voltage to ground: There should be less than 0.2 V. Poor ground (G505) An open or high resistance in the ground wire E15 BLK Under all conditions Measure the voltage to ground: There should be less than 0.2 V. Poor ground (G201) An open or high resistance in the ground wire E16 BLK Under all conditions Measure the voltage to ground: There should be less than 0.2 V. Poor ground (G201) An open or high resistance in the ground wire
11. If multiple failures are found on more than one control unit, replace the driver's under-dash fuse/relay box (includes the driver's MICU), USA models (see «DRIVER'S UNDER-DASH FUSE/RELAY BOX (MICU)REMOVAL AND INSTALLATION»(/acura/tsx/ii-2008-2014/remont/fuses-circuit-breakers/#under-dash-fuserelay-box-4-cyl__drivers-under-dash-fuserelay-box-micu-removal) ), Canada models (see «SPECIAL TOOLS REQUIRED»(/acura/tsx/ii-2008-2014/remont/fuses-circuit-breakers/#under-dash-fuserelay-box-4-cyl__special-tools-required) ). If input failures are related to a particular control unit, replace the control unit.

See also:
• GENERAL TROUBLESHOOTING INFORMATION
• B10CF
• B1077
• B1275
• B1279
• B1280
• B1281
• B1028
• B11CF
• B1575
• U0155
• U0199
• U1282
• B1125
• B1127
• B1128
• B1129
• B1130
• B1140
• B1142
• B1145
• U0155
• U0164
• U1282
• U1283
• B1152
• B1175
• B1176
• U0029
• U0100
• U0122
• U0127
• U0131
• U0151
• U0230
• U1282
• U1283
• B1775
• B1776
• B1779
• B1780
• B1792
• U0155
• B121A
• B2240
• U0100
• U128D
• B1802
• B1825
• B1826
• B1827
• B1828
• B1829
• B1836
• B1837
• B1844
• B1845
• B1846
• B1847
• U0155
• U0199
• U1282
• B1352
• B1375
• B1376
• B1377
• B1378
• B1379
• B1380
• B1381
• B1382
• B1383
• B1384
• B1386
• B1387
• B1388
• B1389
• B1390
• U0155
• U0199
• U1282
• U1283
• SELF-DIAGNOSTIC FUNCTION
• DRIVER'S UNDER-DASH FUSE/RELAY BOX (MICU)REMOVAL AND INSTALLATION
• SPECIAL TOOLS REQUIRED
• GAUGE CONTROL MODULE INPUT TEST
• IMMOBILIZER-KEYLESS CONTROL UNIT INPUT TEST
• POWER WINDOW MASTER SWITCH INPUT TEST
• NAVIGATION UNIT CONNECTOR FOR INPUTS AND OUTPUTS
• NAVIGATION DISPLAY UNIT CONNECTOR FOR INPUTS AND OUTPUTS
• POWER SEAT CONTROL UNIT INPUT TEST/REPLACEMENT
• SYSTEM DESCRIPTION
• CONTROL UNIT INPUT TEST/REPLACEMENT
• DRIVER'S DASHBOARD LOWER COVER REMOVAL/INSTALLATION
• INSTALLATION
• BATTERY TEST
• GAUGE CONTROL MODULE REPLACEMENT
• POWER WINDOW MASTER SWITCH REPLACEMENT
• AUDIO UNIT CONNECTOR FOR INPUTS AND OUTPUTS (WITH ELS AUDIO)
• AUDIO-NAVIGATION SWITCH PANEL FOR INPUTS AND OUTPUTS (WITH ELS AUDIO)
• DRIVER'S DASHBOARD UNDERCOVER REMOVAL/INSTALLATION
• TRIM REMOVAL/INSTALLATION - DOOR AREAS
• B-CAN SYSTEM DIAGNOSIS TEST MODE A
• DTC U1280: COMMUNICATION BUS LINE ERROR (BUS-OFF)
• B10A2
• B1036
• U0155
• U0199
• U1283
• B11A2
• B11C7
• U0155
• U1282
• SLEEP AND WAKE-UP MODE TEST
• DRIVER'S MICU
• MICU INPUT TEST
• HDS INPUTS AND FUNCTION TESTS
• USING THE B-CAN SYSTEM DIAGNOSIS TEST MODE 1 (USE ONLY IF THE HDS IS UNAVAILABLE)