Multiplex Integrated Control System Acura TSX I

Scheme 1

Scheme 2

Troubleshooting the CAN circuit related problems

Note. Check ECM/PCM for DTCs, and troubleshoot the ECM/PCM F-CAN DTCs first.

Using the HDS (Preferred method)

1. Go to «B-CAN SYSTEM DIAGNOSIS TEST MODE A»(/acura/tsx/i-2003-2008/remont/communication-devices/#multiplex-integrated-control-system__troubleshooting-b-can-system-diagnosis-test) to check for "Connected units" and DTCs .
2. If no DTCs are retrieved, go to «B-CAN SYSTEM DIAGNOSIS TEST MODE C»(/acura/tsx/i-2003-2008/remont/communication-devices/#multiplex-integrated-control-system__troubleshooting-b-can-system-diagnosis-test) or «D»(/acura/tsx/i-2003-2008/remont/communication-devices/#multiplex-integrated-control-system__troubleshooting-b-can-system-diagnosis-test) . Without the HDS (Should be used only if HDS is unavailable)
3. Check for communication circuit problems using 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/i-2003-2008/remont/communication-devices/#multiplex-integrated-control-system) ).
4. Check for DTCs while in Mode 1 (see «TROUBLESHOOTING - B-CAN SYSTEM DIAGNOSIS TEST MODE 1 AND TEST MODE 2 (WITHOUT THE HDS)»(/acura/tsx/i-2003-2008/remont/communication-devices/#multiplex-integrated-control-system) ).
5. Sort, and then troubleshoot the DTCs in the order below. Refer to the «DTC TROUBLESHOOTING»(/acura/tsx/i-2003-2008/remont/communication-devices/#multiplex-integrated-control-system) for DTC descriptions. 1st. Internal error and voltage failure DTCs 2nd. Loss of communication DTCs 3rd. Signal error DTCs
6. If no DTCs are retrieved, use B-CAN System Diagnosis Test Mode 2 to check all inputs related to failure (see «TROUBLESHOOTING - B-CAN SYSTEM DIAGNOSIS TEST MODE 1 AND TEST MODE 2 (WITHOUT THE HDS)»(/acura/tsx/i-2003-2008/remont/communication-devices/#multiplex-integrated-control-system) ). Loss of Communication DTC cross-reference chart When an ECU is unable to communicate with the other ECUs on the circuit, the other units will set loss of communication DTCs. Use this chart to find the control unit that is not communicating.
7. Find the Transmitting Unit that is in the same row as all of the loss of communication DTCs retrieved.
8. Perform the input test for the transmitting unit.

LOSS OF COMMUNICATION DTC CROSS-REFERENCE CHART

DTC Troubleshooting Index

DTC TROUBLESHOOTING INDEX

DIAGNOSTIC TROUBLE CODES

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

Fast controller Area Network (F-CAN) and Body Controller Area Network (B-CAN) share information between multiple Electronic Control Units (ECUs). B-CAN communication moves at a slower speed for convenience related items, and for other functions. F-Can information moves at a faster speed for "real time" functions such as fuel and emissions data. To allow both systems to share information, the Gauge Control Module translates information from B-CAN to F-CAN and from F-CAN to B-CAN.

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

Scheme 3

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

Scheme 4

"Connected" ECUs

Several ECUs are connected to each of the two networks. The Gauge Control Module is part of both networks since it is the "Gateway" between them. Below is a list of ECUs and the network they are connected to.

B-CAN ECUs

1. Gauge Control Module
2. Relay Control Module
3. Multiplex Integrated Control Unit (MICU)
4. Door Multiplex Control Unit
5. Combination Switch Control Unit
6. Climate Control Unit
7. Power Seat Control Unit
8. HandsFreeLink Control Unit

F-CAN ECUs

Scheme 5

1. Gauge Control Module
2. ECM/PCM
3. Navigation Control Unit
4. VSA (Vehicle Stability Assist)
5. TPMS Control Unit

Network "Loss of Communication" Error Checking

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

Example of communication circuit test

Normal circuit

Scheme 6

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

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

Diagnostic Trouble Codes

There are three DTC types used by the CAN networks.

COMBINATION SWITCH CONTROL UNIT

B-CAN System Switch Device Index

COMBINATION SWITCH CONTROL UNIT REFERENCE CHART

RELAY CONTROL MODULE REFERENCE CHART

DOOR MULTIPLEX CONTROL UNIT REFERENCE CHART

MULTIPLEX INTEGRATED CONTROL UNIT REFERENCE CHART

GAUGE CONTROL MODULE REFERENCE CHART

CLIMATE CONTROL UNIT REFERENCE CHART

POWER SEAT CONTROL UNIT REFERENCE CHART

HANDSFREELINK CONTROL UNIT REFERENCE CHART

HDS Inputs and Commands

Input

HDS INPUTS AND COMMANDS INPUT AND DATA LIST

Output

HDS INPUTS AND COMMANDS OUTPUT AND DATA LIST

Output

HDS INPUTS AND COMMANDS OUTPUT AND DATA LIST

Troubleshooting - B-CAN System Diagnosis Test Mode A

Note. Perform this diagnosis first if the symptom is related to the B-CAN system. Always cycle the ignition switch within 3 seconds when prompted in the DTC troubleshooting procedures in this article.

1. Make sure the system is related to B-CAN. Gauge control module Exterior lights Turn signals Entry light control Interior lights Safety indicators Rear window defogger Horns (security and panic) Chimes (key, seatbelt and lights ON) Power windows Moonroof timer Wiper/washer Security Keyless entry Power door locks Climate control Key interlock Dash light brightness Driving position memory HandsFreeLink Is the symptom related to the B-CAN system? YES -Go to step 2. NO -Go to the system troubleshooting for the system with the symptom.
2. Connect the Honda Diagnostic System (HDS).
3. From BODY ELECTRICAL MENU, select connected units UNIT INFORMATION, and then select CONNECTED UNIT. MICU Door multiplex control unit Gauge control module Combination switch control unit Relay control module Climate control unit Power seat control unit HandsFreeLink control unit NOTE: If the unit is communicating with the scan tool, DETECT will be displayed. If the 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 all units are not communicating, or only the MICU is communicating, go to «DTC B1000 TROUBLESHOOTING»(/acura/tsx/i-2003-2008/remont/communication-devices/#multiplex-integrated-control-system__dtc-b1000-communication-bus-line-error) .
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 the following items, go to «B-CAN SYSTEM DIAGNOSIS TEST MODE C»(/acura/tsx/i-2003-2008/remont/communication-devices/#multiplex-integrated-control-system__troubleshooting-b-can-system-diagnosis-test) . Exterior lights Turn signals Entry light control Interior lights Rear window defogger (climate control) Horns (security and panic) Power windows Moonroof timer Wiper/washer Power door locks NOTE: If the problem is related to one of the following items, go to the troubleshooting for that individual system. Gauge control module Safety indicators Chimes (key, seat belt and lights ON) Security Keyless entry Climate control Key interlock Dash light brightness Audio System Navigation Driving position memory HandsFreeLink
5. Record all DTCs and sort them by DTC type using the DTC troubleshooting.
6. Troubleshoot the DTC(s) in the following order: Battery voltage DTCs. Internal error DTCs. Loss of communication DTCs. Begin troubleshooting with the lowest number first (Example: if DTC B1006 and B1058 are retrieved, begin by troubleshooting B1006). Signal error DTCs.

Troubleshooting - B-CAN System Diagnosis Test Mode B

Note. Perform this diagnosis if any of the control units are not communicating (NONE displayed in the HDS.) as found by the B-CAN system Diagnosis Test Mode A. Always cycle the ignition switch within 3 seconds when prompted in the DTC troubleshooting procedures in this article.

1. Using the Honda Diagnostic System (HDS), select the system that has the symptom from the BODY ELECTRICAL MENU.
2. Select DTCs, and then check for loss of communication DTCs (use the DTC Troubleshooting to find the DTC type). Are 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. INPUT TEST FOR UNIT NOT COMMUNICATING WITH HDS Unit not communicating MICU (see «MICU INPUT TEST»(/acura/tsx/i-2003-2008/remont/communication-devices/#multiplex-integrated-control-system) ) Door multiplex control unit (see «DOOR MULTIPLEX CONTROL UNIT INPUT TEST»(/acura/tsx/i-2003-2008/remont/communication-devices/#multiplex-integrated-control-system) ) Gauge control module (see «GAUGE CONTROL MODULE INPUT TEST»(/acura/tsx/i-2003-2008/remont/communication-devices/#multiplex-integrated-control-system) ) Relay control module (see «RELAY CONTROL MODULE INPUT TEST»(/acura/tsx/i-2003-2008/remont/communication-devices/#multiplex-integrated-control-system) ) Climate control unit (see «CLIMATE CONTROL UNIT INPUT TEST»(/acura/tsx/i-2003-2008/remont/communication-devices/#multiplex-integrated-control-system) ) Combination switch control unit (see «COMBINATION SWITCH CONTROL UNIT INPUT TEST»(/acura/tsx/i-2003-2008/remont/communication-devices/#multiplex-integrated-control-system) ) Power seat control unit (see «POWER SEAT CONTROL UNIT INPUT TEST»(/acura/tsx/i-2003-2008/remont/memory-modules/#driver-position-memory-system-dpms__power-seat-control-unit-input-test) ) HandsFreeLink control unit (see «CONTROL UNIT INPUT TEST/REPLACEMENT»(/acura/tsx/i-2003-2008/remont/entertainment-systems/#handsfreelink-system__control-unit-input-testreplacement) )

Troubleshooting - B-CAN System Diagnosis Test Mode C

Note. Perform this diagnosis if a component that is controlled by the B-CAN system does not stop or does not turn off. If the component does not turn ON, go to B-CAN SYSTEM DIAGNOSIS TEST MODE D . See the B-CAN system unit input/output index for a list of input and output devices and the control units that monitor the input and controls the output devices (see HDS INPUTS AND COMMANDS ). Always cycle the ignition switch within 3 seconds when prompted in the DTC troubleshooting procedures in this article.

1. Check for DTCs by selecting the TEST MODE MENU from the Honda Diagnostic System (HDS). Are any DTCs indicated? YES -Go to «B-CAN SYSTEM DIAGNOSIS TEST MODE A»(/acura/tsx/i-2003-2008/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 tester indicate the switch is OFF? YES -Go to step 4. NO -Go to step 6 .
4. In the DATA LIST check the output signal of the malfunctioning component. Is the output signal OFF? YES -Go to step 5. NO -Replace the control unit that controls the device that will not turn OFF (see «HDS INPUTS AND COMMANDS»(/acura/tsx/i-2003-2008/remont/communication-devices/#multiplex-integrated-control-system__hds-inputs-and-commands) ).
5. Check the relay if applicable, then check for a short in the wire between the relay and the component, relay and control unit or the component and control unit. Are the relay and the wire harness OK? YES -Replace the control unit that controls the component that will not turn OFF. NO -Replace the relay or repair the wire harness.
6. Check the switch, then check for a short in the wire between the switch and the control unit that monitors the switch. Is the switch and wire harness OK? YES -Replace the control unit that monitors the switch. NO -Replace the switch or repair the wire harness.

Troubleshooting - B-CAN System Diagnosis Test Mode D

Note. Perform this diagnosis a component that is controlled by the B-CAN system does not run or does not come on. If the component does not turn off or does not stop, go to B-CAN SYSTEM DIAGNOSIS TEST MODE C . See the B-CAN system unit input/output index for a list of input and output devices and the control units that monitor the input and controls the output devices (see HDS INPUTS AND COMMANDS ). Always cycle the ignition switch within 3 seconds when prompted in the DTC troubleshooting procedures in this article.

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 Honda Diagnostic System (HDS). Are any DTCs indicated ? YES -Go to «B-CAN SYSTEM DIAGNOSIS TEST MODE A»(/acura/tsx/i-2003-2008/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 component, connect a voltmeter between the malfunctioning component and body ground on the wire that the control unit uses to control the component circuit.
8. Select MISC. TEST from the TEST MODE MENU, and do the forced operation test of the malfunctioning component. Is there a change in voltage (12 V to 0 V or 0 V to 12 V)? YES -Replace the component. NO -Replace the control unit that controls the malfunctioning component.
9. Select DATA LIST from the TEST MODE MENU, and make sure the switch signal input for the malfunctioning system indicates a change when operated. Does the switch input indicate ON when the switch is ON? YES -Replace the control unit that controls the malfunctioning component. NO -Go to step 10.
10. Check the switch and its ground (if applicable), then check for an open or a short in the wire between the switch and the control unit that monitors it. Is the switch and the wire harness OK? YES -Replace the control unit that monitors the switch. NO -Replace the switch or repair the wire harness.

Scheme 7

1. Check the No. 7 (10 A) fuse and No. 21 (7.5 A) 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 left kick panel (see «TRIM REMOVAL/INSTALLATION - DOOR AREAS»(/acura/tsx/i-2003-2008/remont/exteriorinterior-trim/#interior-trim__trim-removalinstallation-door-areas) ).
3. Turn the ignition switch ON (II).
4. Connect the MPCS Service connector (A) to the MCIC socket (B) in the under-dash fuse/relay box.
5. Wait 5 seconds, then watch the ceiling light.
6. If there is a DTC, the ceiling light and ignition switch light will blink, pause, then repeat the DTC as long as the ignition switch is ON (II). Is there a repeating DTC? YES -Count the blinks, then go to step 7. NO -Go to step 8 .
7. About 1 second after you go into self-diagnosis Mode 1, the ceiling light will indicate the DTC, and repeat it every 3 seconds. If there is more than one DTC, the system will indicate them in ascending order, beginning from the DTC with the lowest numerical value. Troubleshoot the DTCs as indicated: DTC 2,3, 4 and 5 simultaneously: Check for an open in the BLU wire between multiplex integrated control unit (MICU) D11 and relay control module K7, BRN/RED wire between MICU J4 and door multiplex control unit No. 16, LT GRN wire between MICU X27 and combination switch control unit No. 4, BRN/YEL *1 (BRN) *2 wire between MICU N28 and gauge control module B14. If the wire is OK, substitute a known-good under-dash fuse/relay box (MICU), under-hood fuse/relay box, power window master switch, wiper/washer switch and gauge one at a time, in that order, and recheck for the DTCs after each substitution. DTC 1 only: Go to «MICU INPUT TEST»(/acura/tsx/i-2003-2008/remont/communication-devices/#multiplex-integrated-control-system) . DTC 2 only (no other DTCs present): Go to the relay control module input test. If all inputs are OK, substitute a known-good relay module and then the MICU, one at a time, and then check for DTCs. If a DTC recurs after a substitution, replace that unit. DTC 3 only (no other DTCs present): Go to the door multiplex control unit input test. If all inputs are OK, substitute a known-good door multiplex control unit and then the MICU, one at a time, and then check for DTCs. If a DTC recurs after a substitution, replace that unit. DTC 4 only (no other DTCs present): Go to the combination switch control unit input test. If all inputs are OK, substitute a known-good wiper/ washer switch and then the MICU, one at a time, and then check for DTCs. If a DTC recurs after a substitution, replace that unit. DTC 5 only (no other DTCs present): Go to the «GAUGE CONTROL MODULE INPUT TEST»(/acura/tsx/i-2003-2008/remont/communication-devices/#multiplex-integrated-control-system) . If all inputs are OK, substitute a known-good gauge control module and then the MICU, one at a time, and then check for DTCs. If a DTC recurs after a substitution, replace that unit. *1: '04-05 models *2: '06-08 models DTC AND CAUSE DTC Cause 1 The MICU cannot receive signals from the bus communication line. 2 The MICU cannot receive signals from the relay module communication line. 3 The MICU cannot receive signals from the power window communication line. 4 The MICU cannot receive signal from the combination switch communication line. 5 The MICU cannot receive signals from the gauge control module.
8. Check for B-CAN DTCs indicated by the gauge control module while still in Test Mode 1. Are any DTCs indicated ? YES -Go to step 9. NO -Go to step 11 .
9. Record all DTCs and sort them by type using the DTC Troubleshooting.
10. Troubleshoot the DTCs in the following order: Battery voltage DTCs Internal error DTCs Loss of communication DTCs (begin with the lowest number first; for example, if B1006 and B1059 are retrieved, troubleshoot B1006 first) Signal error DTCs Test mode 2
11. Remove the MPCS service connector from the under-dash fuse/relay box socket for 5-10 seconds, then re-insert it. 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 Model.
12. In the table below is a list of 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. MICU MICU ITEM REFERENCE CHART Item Driver's door switch (OPEN) Front passenger's door switch (OPEN) Left rear door switch (OPEN) Right rear door switch (OPEN) Trunk lid latch switch (OPEN) Front passenger's door lock knob switch (UNLOCK) (1) Left rear door lock knob switch (UNLOCK) Right rear door lock knob switch (UNLOCK) (1) Audio-HVAC display module security ground (disconnected) Driver's seat belt buckle switch (unbuckled) Brake pedal position switch (ON; brake pedal pressed) Passenger's door lock switch (LOCK/UNLOCK) (1) The front passenger's and right rear door lock knob switches must be in the locked position when beginning the test. RELAY CONTROL MODULE RELAY CONTROL MODULE REFERENCE CHART Item Windshield wiper switch (AUTO STOP/ PARK) Hood switch (open) A/C pressure switch (/thermal protector (A/C ON) COMBINATION SWITCH CONTROL UNIT COMBINATION SWITCH CONTROL UNIT REFERENCE CHART Item Turn signal switch (LEFT) Turn signal switch (RIGHT) Combination light switch (ON; each position) Dimmer switch (ON) Passing switch (ON) Windshield wiper switch (ON) Intermittent wiper dwell timer Windshield washer switch (ON) POWER WINDOW MASTER SWITCH (DOOR MULTIPLEX CONTROL UNIT) POWER WINDOW MASTER SWITCH (DOOR MULTIPLEX CONTROL UNIT) REFERENCE CHART Item Power window master switch (Driver's Window UP) Power window master switch (Driver's Window DOWN) Power window master switch (Driver's Window AUTO UP) Power window master switch (Driver's Window AUTO DOWN) Power window master switch (Front Passenger's Window UP) Power window master switch (Front Passenger's Window DOWN) Power window master switch (Left Rear Window UP) Power window master switch (Left Rear Window DOWN) Power window master switch (Right Rear Window UP) Power window master switch (Right Rear Window DOWN) Driver's door key cylinder switch (1) (LOCK) Driver's door key cylinder switch (1) (UNLOCK) Driver's door lock switch (LOCK) Driver's door lock switch (UNLOCK) Driver's door lock knob switch (LOCK) Driver's door lock knob switch (UNLOCK) (1) A second key is necessary to check the key cylinder inputs. Be sure to rotate the key cylinder switch two times to each position (lock and lock, unlock and unlock) to ensure the door lock knob switch is in the appropriate position. GAUGE CONTROL MODULE GAUGE CONTROL MODULE REFERENCE CHART Item Parking brake switch (ON; parking brake applied) Cruise control SET/RESUME/CANCEL switch (ON; switch pressed) Transmission range switch (P, R, N, D) Washer fluid level switch (Canada) Brake fluid level switch (fluid removed) POWER SEAT CONTROL UNIT POWER SEAT CONTROL UNIT REFERENCE CHART Item Power seat slide switch (Forward, Backward) Power seat front up-down switch (UP, Down) Power seat rear up-down switch (UP, Down) Power seat recline switch (Forward, Recline) Does the ceiling light indicate proper switch operation? YES -Go to function and input test for the system related to the failure. NO -Repair the open, short, or replace the faulty switch.

Scheme 8

1. Set the multiplex in Test Mode 1. 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 ODO display when the communication between the Multiplex Integrated Control Unit (MICU) and the gauge control module is normal. To scroll through the DTCs, press the RESET knob on the gauge control module.

TEST MODE DISPLAY REFERENCE CHART

How to clear the DTC

1. While in Test Mode 1, press and hold down the RESET knob for more than 10 seconds.
2. The unit that has stored the code can be identified by the number shown on the trip display.

Scheme 9

Scheme 10

DTC B1000: Communication Bus Line Error

1. Clear the DTCs using the HDS.
2. Cycle the ignition switch to OFF, and then back ON.
3. Check for DTCs using the HDS. Is DTC B1000 indicated? YES -Go to step 4. NO -Intermittent failure. The communication bus line 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/i-2003-2008/remont/body-electrical/#battery) ) and the charging system (see «CHARGING SYSTEM INDICATOR CIRCUIT TROUBLESHOOTING»(/acura/tsx/i-2003-2008/remont/charging-system/#charging-system) ).
4. Check for DTCs using the HDS. Are DTCs B1005, B1006, B1007, B1008, and B1010 also indicated? YES -Go to step 5. NO -Replace the MICU.
5. Disconnect each control unit one at a time. Clear the DTC, then recheck for DTCs after each unit is disconnected. Gauge control module Relay control module Door multiplex control unit Climate control unit Combination switch control unit HandsFreeLink control unit Power seat control unit Is DTC B1000 indicated with each unit disconnected? YES -Check for a short to power or ground in the communication circuit by disconnecting the harness at each control unit and testing for continuity to ground or short to power. Repair or replace the harness as necessary. NO -Replace the control unit that was disconnected, and did not set DTC B1000.

DTC B1050, B1100, B1150, B1200, B1250, B1750, B1800: Communication Bus Line Error

1. Clear the DTCs using the HDS.
2. Cycle the ignition switch to OFF, and then back ON.
3. Check for DTCs using the HDS. Are DTC(s) B1050, B1100, B1150, B1200, B1250, B1750 or B1800 indicated? YES -Go to step 4. NO -Intermittent failure, the system is OK at this time. DTC REFERENCE CHART B1050 Relay Control Module B1100 Door Multiplex Control Unit B1150 Gauge Control Module B1200 Audio-HVAC-Display Module B1250 Combination Switch Control Unit B1750 HandsFreeLink Control Unit B1800 Power Seat Control Unit
4. Check for DTCs using the HDS. Is DTC(s) B1000 indicated? \ YES -Troubleshoot DTC B1000. NO -If DTC B1050 is indicated, replace the relay control module. If DTC B1100 is indicated, replace the door multiplex control unit. If DTC B1150 is indicated, replace the gauge control module (see «GAUGE CONTROL MODULE REPLACEMENT»(/acura/tsx/i-2003-2008/remont/gauges-instrument-panels/#display-and-gauge-system__gauge-control-module-replacement) ). If DTC1200 is indicated, replace the climate control unit. If DTC B1250 is indicated, replace the combination switch control unit. If DTC B1750 is indicated, replace the HandsFreeLink control unit. If DTC B1800 is indicated, replace the power seat control unit.

DTC B1001, B1002: Multiplex Integrated Control Unit (MICU) Internal Error

1. Clear the DTCs using the HDS.
2. Cycle the ignition switch to OFF, and then back ON.
3. Operate the door lock (LOCK/UNLOCK).
4. Check for DTCs using the HDS. Is DTC B1001 or B1002 indicated? YES -Faulty MICU; replace the under-dash fuse/ relay box. NO -Intermittent failure, the MICU 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/i-2003-2008/remont/body-electrical/#battery) ) and the charging system (see «CHARGING SYSTEM INDICATOR CIRCUIT TROUBLESHOOTING»(/acura/tsx/i-2003-2008/remont/charging-system/#charging-system) ).

DTC B1005: MICU Lost Communication with Relay 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 ).

1. Clear the DTCs using the HDS.
2. Cycle the ignition switch to OFF, and then back ON.
3. Check for DTCs using the HDS. Is DTC B1005 indicated? YES -Go to step 4. NO -Intermittent failure, the relay module 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/i-2003-2008/remont/body-electrical/#battery) ) and the charging system (see «CHARGING SYSTEM INDICATOR CIRCUIT TROUBLESHOOTING»(/acura/tsx/i-2003-2008/remont/charging-system/#charging-system) ).
4. Check for DTCs in the gauge control module using the HDS. Is DTC B1158 also indicated? YES -Go to «RELAY CONTROL MODULE INPUT TEST»(/acura/tsx/i-2003-2008/remont/communication-devices/#multiplex-integrated-control-system) . NO -Check for an open, or a short to power or ground in the communication circuit between the MICU and the relay control module. If the circuit is OK, replace the MICU. If the circuit is bad, repair the open, or short to power or ground.

DTC B1006: MICU Lost Communication with Door Multiplex Control Unit (Door Lock Switch 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 using the HDS.
2. Cycle the ignition switch to OFF, and then back ON.
3. Check for DTCs using the HDS. Is DTC B1006 indicated ? YES -Go to step 4. NO -Intermittent failure, the door multiplex control unit 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/i-2003-2008/remont/body-electrical/#battery) ) and the charging system (see «CHARGING SYSTEM INDICATOR CIRCUIT TROUBLESHOOTING»(/acura/tsx/i-2003-2008/remont/charging-system/#charging-system) ).
4. Check for DTCs in the gauge control module and relay module using the HDS. Are DTCs B1160 and B1058 also indicated? YES -Go to «DOOR MULTIPLEX CONTROL UNIT INPUT TEST»(/acura/tsx/i-2003-2008/remont/communication-devices/#multiplex-integrated-control-system) . NO -Check for an open, or a short to power or ground in the communication circuit between the MICU and the door multiplex control unit. If the circuit is OK, replace the MICU. If the circuit is bad, repair the open, or short to power or ground.

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

Note. If you are troubleshooting multiple DTC's, 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 using the HDS.
2. Cycle the ignition switch to OFF, and then back ON.
3. Check for DTCs using the HDS. Is DTC B1007 indicated? YES -Go to step 4. NO -Intermittent failure, the MICU 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/i-2003-2008/remont/body-electrical/#battery) ) and the charging system (see «CHARGING SYSTEM INDICATOR CIRCUIT TROUBLESHOOTING»(/acura/tsx/i-2003-2008/remont/charging-system/#charging-system) ).
4. Check for DTCs of the gauge control module and relay control module using the HDS. Are DTCs B1155 and B1062 also indicated? YES -Go to the «COMBINATION SWITCH CONTROL UNIT INPUT TEST»(/acura/tsx/i-2003-2008/remont/communication-devices/#multiplex-integrated-control-system) . NO -Check for an open, or a short to power or ground in the communication circuit between the MICU and the combination switch control unit. If the circuit is OK, replace the MICU. If the circuit is bad, repair the open, or short to power or ground.

DTC B1008: MICU Lost Communication with Gauge Control Module (A/T Message)

Note. If you are troubleshooting multiple DTC's, 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 using the HDS.
2. Cycle the ignition switch to OFF, and then back ON.
3. Check for DTCs using the HDS. Is DTC B1008 indicated? YES -Go to step 4. NO -Intermittent failure, the gauge control module 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/i-2003-2008/remont/body-electrical/#battery) ) and the charging system (see «CHARGING SYSTEM INDICATOR CIRCUIT TROUBLESHOOTING»(/acura/tsx/i-2003-2008/remont/charging-system/#charging-system) ).
4. Check for DTCs in the relay control module using the HDS. Are DTCs B1061 and B1808 also indicated? YES -Go to the «GAUGE CONTROL MODULE INPUT TEST»(/acura/tsx/i-2003-2008/remont/communication-devices/#multiplex-integrated-control-system) . NO -Check for an open, or a short to power or ground in the communication circuit between the MICU and the gauge control module. If the circuit is OK, replace the MICU. If the circuit is bad, repair the open, or short to power or ground.

DTC B1010: MICU Lost Communication with Door Multiplex Control Unit (Panic Message)

Note. If you are troubleshooting multiple DTC's, 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 using the HDS.
2. Cycle the ignition switch to OFF, and then back ON.
3. Check for DTCs using the HDS. Is DTC B1010 indicated? YES -Go to step 4. NO -Intermittent failure, the door multiplex control unit 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/i-2003-2008/remont/body-electrical/#battery) ) and the charging system (see «CHARGING SYSTEM INDICATOR CIRCUIT TROUBLESHOOTING»(/acura/tsx/i-2003-2008/remont/charging-system/#charging-system) ).
4. Check for DTCs of the relay control module using the HDS. Is DTC B1059 also indicated? YES -Go to the «DOOR MULTIPLEX CONTROL UNIT INPUT TEST»(/acura/tsx/i-2003-2008/remont/communication-devices/#multiplex-integrated-control-system) . NO -Check for an open, or a short to power or ground in the communication circuit between the MICU and the door multiplex control unit. If the circuit is OK, replace the MICU. If the circuit is bad, repair the open, or short to power or ground.

DTC B1102: Door Multiplex Control Unit Internal Error

Note. If you are troubleshooting multiple DTC's, 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 using the HDS.
2. Cycle the ignition switch to OFF, and then back ON.
3. Operate the power window (UP/DOWN).
4. Check for DTCs using the HDS. Is DTC B1102 indicated? YES -Faulty door multiplex control unit; replace the power window master switch. NO -Intermittent failure, the door multiplex control unit 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/i-2003-2008/remont/body-electrical/#battery) ) and the charging system (see «CHARGING SYSTEM INDICATOR CIRCUIT TROUBLESHOOTING»(/acura/tsx/i-2003-2008/remont/charging-system/#charging-system) ).

DTC B1105: Door Multiplex Control Unit Lost Communication with MICU (Door Switch Message) ('05-08 models)

Note. If you are troubleshooting multiple DTC's, 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 using the HDS.
2. Cycle the ignition switch to OFF, and then back ON.
3. Check for DTCs using the HDS. Is DTC B1105 indicated? YES -Go to step 4. NO -Intermittent failure, MICU 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/i-2003-2008/remont/body-electrical/#battery) ) and the charging system (see «CHARGING SYSTEM INDICATOR CIRCUIT TROUBLESHOOTING»(/acura/tsx/i-2003-2008/remont/charging-system/#charging-system) ).
4. Check for DTCs in the gauge control module and relay control module using the HDS. Are DTCs B1057 and B1159 also indicated? YES -Go to «MICU INPUT TEST»(/acura/tsx/i-2003-2008/remont/communication-devices/#multiplex-integrated-control-system) . NO -Go to Power Window Master Switch Input Test (see «POWER WINDOW MASTER SWITCH INPUT TEST»(/acura/tsx/i-2003-2008/remont/windows/#power-window-system) ).

DTC B1106: Door Multiplex Control Unit Lost Communication with MICU (MICU Message) ('05-08 models)

Note. If you are troubleshooting multiple DTC's, 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 using the HDS.
2. Cycle the ignition switch to OFF, and then back ON.
3. Check for DTCs using the HDS. Is DTC B1106 indicated? YES -Go to step 4. NO -Intermittent failure, MICU 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/i-2003-2008/remont/body-electrical/#battery) ) and the charging system (see «CHARGING SYSTEM INDICATOR CIRCUIT TROUBLESHOOTING»(/acura/tsx/i-2003-2008/remont/charging-system/#charging-system) ).
4. Check for DTCs in the gauge control module, relay control module, and combination switch control unit using the HDS. Are DTCs B1055, B1057, and B1255 also indicated? YES -Go to «MICU INPUT TEST»(/acura/tsx/i-2003-2008/remont/communication-devices/#multiplex-integrated-control-system) . NO -Go to Power Window Master Switch Input Test (see «POWER WINDOW MASTER SWITCH INPUT TEST»(/acura/tsx/i-2003-2008/remont/windows/#power-window-system) ).

DTC B1178: F-CAN Communication Line Error; DTC B1168: Gauge Control Module Lost Communication with ECM/PCM (Engine Messages); DTC B1169: Gauge Control Module Lost Communication with PCM (A/T Messages)

Note. If you are troubleshooting multiple DTC's, 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 using the HDS.
2. Turn the ignition switch OFF then back to the ON (II).
3. Start and run the engine for at least 5 seconds then turn the engine off.
4. Check for DTCs using the HDS. Is DTC B1178, B1168, and/or B1169 indicated ? YES -Go to step 5. NO -Intermittent failure, the F-CAN communication line 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/i-2003-2008/remont/body-electrical/#battery) ) and the charging system (see «CHARGING SYSTEM INDICATOR CIRCUIT TROUBLESHOOTING»(/acura/tsx/i-2003-2008/remont/charging-system/#charging-system) ).
5. Check for DTCs in the ECM/PCM. Are any DTCs indicated? YES -Troubleshoot the ECM/PCM DTCs. NO -Go to step 6.
6. Perform the Gauge Control Module Input Test (see «GAUGE CONTROL MODULE INPUT TEST»(/acura/tsx/i-2003-2008/remont/communication-devices/#multiplex-integrated-control-system) ). Are ail inputs OK? YES -Go to step 7. NO -Repair the faulty input then recheck for DTCs.
7. Substitute a know-good gauge control module.
8. Clear the DTCs using the HDS.
9. Turn the ignition switch OFF then back to the ON (II).
10. Start and run the engine for at least 5 seconds then turn the engine off.
11. Check for DTCs using the HDS. Is DTC B1178, B1168, and/or B1169 indicated? YES -Replace the ECM/PCM. NO -The original gauge control module is faulty; replace the gauge control module (see «GAUGE CONTROL MODULE REPLACEMENT»(/acura/tsx/i-2003-2008/remont/gauges-instrument-panels/#display-and-gauge-system__gauge-control-module-replacement) ).

DTC B1080: Power Supply Circuit (IG1 line) Input Error for Relay Control Module and MICU

Note. If you are troubleshooting multiple DTC's, 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 using the HDS.
2. Cycle the ignition switch to OFF, and then back ON.
3. Turn the ignition switch ON (II) and wait for 2 seconds or more. Is DTC F31080 indicated again? YES -Go to step 4. NO -Intermittent failure, the relay control module 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/i-2003-2008/remont/body-electrical/#battery) ) and the charging system (see «CHARGING SYSTEM INDICATOR CIRCUIT TROUBLESHOOTING»(/acura/tsx/i-2003-2008/remont/charging-system/#charging-system) ).
4. Check the MICU IG1 power supply No. 21 (7.5 A) fuse in the under-dash fuse/relay box. Is the fuse OK? YES -Go to «MICU INPUT TEST»(/acura/tsx/i-2003-2008/remont/communication-devices/#multiplex-integrated-control-system) . NO -Replace the fuse and recheck for DTCs.

DTC B1251: Combination Switch Control Unit Internal Error

Note. If you are troubleshooting multiple DTC's, 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 using the HDS.
2. Cycle the ignition switch to OFF, and then back ON.
3. Check for DTCs using the HDS. Is DTC B1251 indicated? YES -Faulty combination switch control unit; replace the wiper/washer switch. NO -Intermittent failure, the CPU in the combination switch control unit 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/i-2003-2008/remont/body-electrical/#battery) ) and the charging system (see «CHARGING SYSTEM INDICATOR CIRCUIT TROUBLESHOOTING»(/acura/tsx/i-2003-2008/remont/charging-system/#charging-system) ).

DTC B1255: Combination Switch Control Unit Lost Communication with 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 using the HDS.
2. Cycle the ignition switch to OFF, and then back ON.
3. Check for DTCs using the HDS. Is DTC B1255 indicated? YES -Go to step 4. NO -Intermittent failure, MICU 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/i-2003-2008/remont/body-electrical/#battery) ) and the charging system (see «CHARGING SYSTEM INDICATOR CIRCUIT TROUBLESHOOTING»(/acura/tsx/i-2003-2008/remont/charging-system/#charging-system) ).
4. Check for DTCs in the combination switch control using the HDS. Are DTCs B1055, B1106, B1157, and B1806 also indicated? YES -Go to «MICU INPUT TEST»(/acura/tsx/i-2003-2008/remont/communication-devices/#multiplex-integrated-control-system) . NO -Replace the combination switch control unit.

Scheme 11

1. Remove the left side kick panel (see «FRONT DOOR SILL AREA»(/acura/tsx/i-2003-2008/remont/exteriorinterior-trim/#interior-trim__front-door-sill-area) ).
2. Disconnect the under-dash fuse/relay box connectors D, E, H, J, K, N, P, X, and W. NOTE: All connectors are shown from the wire side of female terminals.
3. 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 4.
4. With the connectors still disconnected from the under-hood fuse/relay box, make these input tests at the connector(s). 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 5. INPUT TEST CONDITION REFERENCE CHART Cavity Wire Test condition Test: Desired result Possible cause if desired result is not obtained H9 BLK Under all conditions Check for continuity to ground: There should be continuity. Poor ground (G601) An open in the wire P1 BRN Under all conditions Check for continuity to ground: There should be continuity. Poor ground (G502) An open in the wire E9 BLK Under all conditions Check for continuity to ground: There should be continuity. Poor ground (G601) An open in the wire N22 LT BLU Under-dash fuse/relay box connector N (45P) disconnected Check for continuity between terminal N22 and the climate control unit B (16P) connector terminal No. 14: There should be continuity. An open in the wire Climate control unit B (16P) connector disconnected Check for continuity to ground: There should be no continuity. Short to ground J4 BRN/RED Under all conditions Check for continuity between terminal J4 and power window master switch 23P connector terminal No. 16: There should be continuity. An open in the wire Power window master switch 23P connector disconnected Check for continuity to ground: There should be no continuity. Short to ground D11 BLU Under all conditions Check for continuity between terminal D11 and relay control module K (10P) connector terminal No. 7: There should be continuity. An open in the wire Relay control module K (10P) connector disconnected Check for continuity to ground: There should be no continuity. Short to ground X27 LT GRN Under all conditions Check for continuity between terminal X27 and wiper/washer switch 8P connector terminal No. 4: There should be continuity. An open in the wire Wiper/washer switch 8P connector disconnected Check for continuity to ground: There should be no continuity Short to ground N28 BRN/YEL (1) BRN (2) Under all conditions Check for continuity between terminal N28 and gauge control module B (18P) connector terminal No. 14: There should be continuity. An open in the wire Gauge control module B (18P) connector disconnected Check for continuity to ground: There should be no continuity. Short to ground G1 GRN/RED Under all conditions Check for continuity between terminal G1 and power seat control unit connector A (40P) No. 40 terminal: There should be continuity. An open in the wire Power seat control unit connector A (40P) disconnected Check for continuity to ground: There should be no continuity. Short to ground X18 BLU Under all conditions Check for continuity between terminal X18 and HandsFreeLink control unit connector (22P) No. 14 terminal: There should be continuity. An open in the wire HandsFreeLink control unit connector (22P) disconnected Check for continuity to ground: There should be no continuity. Short to ground (1) '04-05 models (2) '06-08 models
5. Reconnect the connectors to the under-dash fuse/relay box; and make sure these input tests at the appropriate connectors on the under-dash fuse/relay box. If any test indicates a problem, find and correct the cause, then recheck the system. If all the input tests prove OK, the multiplex integrated control unit must be faulty, replace the under-dash fuse/ relay box assembly. INPUT TEST CONDITION REFERENCE CHART Cavity Wire Test condition Test: Desired result Possible cause if desired result is not obtained P7 WHT/BLK (1) WHT (2) Under all conditions Attach to ground: The ignition key light should come on. Blown No. 13 (20 A) fuse in the under-hood fuse/relay box Blown LED An open in the wire W4 GRN/RED Ceiling light switch in the middle position, all doors closed Attach to ground: The ceiling light should come on. Blown No. 6 (7.5 A) fuse in the under-dash fuse/relay box Faulty ceiling light An open in the wire D6 <-- [bull] --> J9 <-- [bull] --> X34 YEL Ignition switch ON (II) Measure the voltage to ground: There should be battery voltage. Blown No. 21 (7.5 A) fuse in the under-dash fuse/relay box An open in the wire K4 GRN/WHT Under all conditions Measure the voltage to ground: There should be battery voltage. Blown No. 27 (20 A) fuse in the under-dash fuse/relay box An open in the wire X35 WHT/RED (1) RED (2) Under all conditions Measure the voltage to ground: There should be battery voltage. Blown No. 7 (10 A) fuse in the under-dash fuse/relay box An open in the wire (1) '04-05 models (2) '06-08 models

Scheme 12

1. Remove the gauge control module (see «GAUGE CONTROL MODULE REPLACEMENT»(/acura/tsx/i-2003-2008/remont/gauges-instrument-panels/#display-and-gauge-system__gauge-control-module-replacement) ).
2. Disconnect the 18P connector from the gauge control module.
3. 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 4.
4. Reconnect the connector to the gauge control module, and make these input tests at the 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 5. INPUT TEST CONDITION REFERENCE CHART Cavity Wire Test Condition Test: Desired result Possible cause if desired result is not obtained B10 YEL Ignition switch ON (II) Measure the voltage to ground: There should be battery voltage Blown No. 21 (7.5 A) fuse in the under-dash fuse/relay box An open in the wire B1 WHT/RED (1) RED (2) Under all conditions Measure the voltage to ground: There should be battery voltage Blown No. 7 (10 A) fuse in the under-dash fuse/relay box An open in the wire B18 BLK Under all conditions Measure the voltage to ground: There should be less than 0.5 V. Poor ground (G503) An open in the wire (1) '04-05 models (2) '06-08 models
5. Disconnect the 18P connector from the gauge control module, and make these input tests at the connector. If any test indicates a problem, find and correct the cause, then recheck the system. If all the input tests prove OK, the gauge control module must be faulty, replace it. INPUT TEST CONDITION REFERENCE CHART Cavity Wire Test Condition Test: Desired result Possible cause if desired result is not obtained B14 BRN/YEL (1) BRN (2) Under-dash fuse/relay box connector N (45P) disconnected Check for continuity between the No. 14 terminal and under-dash fuse/relay box N (45P) connector No. 28 terminal: There should be continuity An open in the wire Check for continuity to ground: There should be no continuity Short to ground on the wire (1) '04-05 models (2) '06-08 models

Scheme 13

1. Remove the driver's door switch panel (see «FRONT DOOR PANEL REMOVAL/INSTALLATION»(/acura/tsx/i-2003-2008/remont/exterior-body-panels/#door-system__front-door-panel-removalinstallation) ).
2. Disconnect the 23P connector from the power window master switch.
3. 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 4.
4. Reconnect the connector to the power window master switch, and make these input tests at the 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 5. INPUT TEST CONDITION REFERENCE CHART Cavity Wire Test condition Test: Desired result Possible cause if desired result is not obtained 1 BLK Under all conditions Measure the voltage to ground: There should be less than 0.5 V. Poor ground (G501, G601) An open in the wire 10 GRN/WHT Under all conditions Measure the voltage to ground: There should be battery voltage. Blown No. 27 (20 A) fuse in the under-dash fuse/relay box An open in the wire 20 YEL Ignition switch ON (II) Measure the voltage to ground: There should be battery voltage. Blown No. 21 (7.5 A) fuse in the under-dash fuse/relay box An open in the wire
5. Disconnect the 23P connector from the power window master switch, and make these input tests at the connector. If any test indicates a problem, find and correct the cause, then recheck the system. If all the input tests prove OK, the door multiplex control unit must be faulty, replace the power window master switch. INPUT TEST CONDITION REFERENCE CHART Cavity Wire Test condition Test: Desired result Possible cause if desired result is not obtained 16 BRN/RED Under-dash fuse/relay box connector J (21P) disconnected Check for continuity between terminal 16 and the under-dash fuse/relay box connector J (21P) connector No. 4 terminal: There should be continuity. An open in the wire Check for continuity to ground: There should be no continuity. Short to ground

Scheme 14

1. Remove the steering column covers (see «STEERING COLUMN REMOVAL AND INSTALLATION»(/acura/tsx/i-2003-2008/remont/manual-power-steering/#power-steering-system__steering-column-removal-and-installation) ).
2. Disconnect the 8P connector from the wiper/washer switch.
3. 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 4.
4. Reconnect the connector to the wiper/washer switch, turn the ignition switch ON (II), and make these input tests at the 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 5. INPUT TEST CONDITION REFERENCE CHART Cavity Wire Test condition Test: Desired result Possible cause if desired result is not obtained 3 BLK Under all conditions Measure the voltage to ground: There should be less than 0.5 V. Poor ground (G501, G601) An open in the wire 8 WHT/RED (1) RED (2) Under all conditions Measure the voltage to ground: There should be battery voltage. Blown No. 7 (10 A) fuse in the under-dash fuse/relay box An open in the wire 7 YEL Ignition switch ON (II) Measure the voltage to ground: There should be battery voltage. Blown No. 21 (7.5 A) fuse in the under-dash fuse/relay box An open in the wire (1) '04-05 models (2) '06-08 models
5. Disconnect the 8P connector from the wiper/washer switch, and make these input tests at the connector. If any test indicates a problem, find and correct the cause, then recheck the system. If all the input tests prove OK, the combination switch control unit must be faulty, replace the wiper/washer switch. INPUT TEST CONDITION REFERENCE CHART Cavity Wire Test condition Test: Desired result Possible cause if desired result is not obtained 4 LTGRN Under-dash fuse/relay box connector X (39P) connector disconnected Check for continuity between terminal 4 and the under-dash fuse/relay box connector X (39P) connector No. 27 terminal: There should be continuity. An open in the wire Check for continuity to ground: There should be no continuity. Short to ground

Scheme 15

1. Remove the under-hood fuse/relay box under cover.
2. Disconnect the 10P connector from the under-hood fuse/relay box.
3. 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 4.
4. Reconnect the connector to the under-hood fuse/relay box, and make these input tests at the 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 5. INPUT TEST CONDITION REFERENCE CHART Cavity Wire Test condition Test: Desired result Possible cause if desired result is not obtained K10 BLK Under all conditions Measure the voltage to ground: There should be less than 0.5 V. Poor ground (G501, G601) An open in the wire K8 YEL Ignition switch ON (II) Measure the voltage to ground: There should be battery voltage. Blown No. 21 (7.5 A) fuse in the under-dash fuse/relay box An open in the wire
5. Disconnect the 10P connector from the under-dash fuse/relay box, and make these input tests at the connector. If any test indicates a problem, find and correct the cause, then recheck the system. If all the input tests prove OK, the relay control module must be faulty, replace the under-hood fuse/relay box. INPUT TEST CONDITION REFERENCE CHART Cavity Wire Test condition Test: Desired result Possible cause if desired result is not obtained K7 BLU Under-dash fuse/relay box connector D (17P) disconnected Check for continuity between No. 7 terminal and the under-dash fuse/relay box connector D (17P) connector No. 11 terminal: There should be continuity. An open in the wire Check for continuity to ground: There should be no continuity. Short to ground

Scheme 16

1. Remove the audio-HVAC display module (see «AUDIO-HVAC DISPLAY MODULE REMOVAL/INSTALLATION»(/acura/tsx/i-2003-2008/remont/entertainment-systems/#audio-system__audio-hvac-display-module-removalinstallation) ).
2. Disconnect the audio-HVAC display panel connector B (16P).
3. 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 4.
4. Reconnect the connector to the audio-HVAC display panel, and make these input tests at the 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 5. INPUT TEST CONDITION REFERENCE CHART Cavity Wire Test condition Test: Desired result Possible cause if desired result is not obtained B4 BLK/YEL (1) YEL (2) Ignition switch ON (II) Measure the voltage to ground: There should be battery voltage. Blown No. 30 (7.5 A) fuse in the under-dash fuse/relay box An open in the wire B6 BLK Under all conditions Measure the voltage to ground: There should be less than 0.5 V. Poor ground (G503) An open in the wire (1) '04 model (2) '05-08 models
5. Disconnect the audio-HVAC display panel connector B (16P), and make these input tests at the connector. If any test indicates a problem, find and correct the cause, then recheck the system. If all the input tests prove OK, the audio-HVAC display panel must be faulty, replace it. INPUT TEST CONDITION REFERENCE CHART Cavity Wire Test condition Test: Desired result Possible cause if desired result is not obtained B14 LT BLU Under-dash fuse/relay box connector N (45P) disconnected Check for continuity between No. 14 terminal and the under-dash fuse/relay box connector N (45P) No. 22 terminal: There should be continuity. An open in the wire Check for continuity to ground: There should be no continuity. Short to ground on the wire

See also:
• B1026
• B1055
• B1075
• B1076
• B1077
• B1125
• B1127
• B1128
• B1140
• B1152
• B1155
• B1156
• B1157
• B1158
• B1159
• B1160
• B1170
• B1175
• B1202
• B1205
• B1275
• B1279
• B1280
• B1281
• B1775
• B1776
• B1779
• B1780
• B1792
• B1802
• B1805
• B1806
• B1807
• B1808
• B1825
• B1826
• B1827
• B1828
• B1829
• B1836
• B1837
• B1844
• B1845
• B1846
• B1847
• POWER SEAT CONTROL UNIT INPUT TEST
• CONTROL UNIT INPUT TEST/REPLACEMENT
• TRIM REMOVAL/INSTALLATION - DOOR AREAS
• BATTERY TEST
• CHARGING SYSTEM INDICATOR CIRCUIT TROUBLESHOOTING
• GAUGE CONTROL MODULE REPLACEMENT
• POWER WINDOW MASTER SWITCH INPUT TEST
• FRONT DOOR SILL AREA
• FRONT DOOR PANEL REMOVAL/INSTALLATION
• STEERING COLUMN REMOVAL AND INSTALLATION
• AUDIO-HVAC DISPLAY MODULE REMOVAL/INSTALLATION
• B-CAN SYSTEM DIAGNOSIS TEST MODE A
• TROUBLESHOOTING - B-CAN SYSTEM DIAGNOSIS TEST MODE 1 AND TEST MODE 2 (WITHOUT THE HDS)
• B1000
• B1001
• B1005
• B1006
• B1007
• B1008
• B1010
• B1050
• B1080
• B1102
• B1105
• B1106
• B1168
• B1251
• B1255
• HDS INPUTS AND COMMANDS