Multiplex Integrated Control System: Diagnosis Acura RL II facelift

Troubleshooting CAN Circuit Related Problems

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

You can easily check the F-CAN and B-CAN connection status and DTCs by using one of the following methods

1. The HDS (Preferred method) can check the F-CAN and B-CAN communication status, read and clear DTCs, display the data list, and perform function tests. Go to «B-CAN SYSTEM DIAGNOSIS TEST MODE A»(ref-348551-S28830677002009112400000) to check "Connected units" and DTCs (see «TROUBLESHOOTING - B-CAN SYSTEM DIAGNOSIS TEST MODE A»(ref-348551-S28830677002009112400000) ).
2. The AcuraLink Self-diagnostic Procedure can check communication status, and read and clear DTCs (see «SELF-DIAGNOSTIC FUNCTION»(ref-348586-S40760904442009112400000) ).
3. The gauge control module self-diagnosis function can check the F-CAN and B-CAN communication status (see «SELF-DIAGNOSTIC FUNCTION»(ref-348531-S03408269372009112400000) ).
4. The MID (multi-information display) can read and clear DTCs (see «GAUGE CONTROL MODULE DTC DISPLAY»(ref-348551-S04590840692009112400000) ).
5. B-CAN System Diagnosis Test Mode 1 and Test Mode 2 can check communication status and test some switch circuits (see «TROUBLESHOOTING - B-CAN SYSTEM DIAGNOSIS TEST MODE 1 AND TEST MODE 2 (WITHOUT THE HDS)»(ref-348551-S36548658072009112400000) ).

How to clear the DTC

While in DTC indication status, press and hold down the SELECT/RESET switch button for about 13 seconds.

Loss of Communication DTC Cross-reference Chart

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

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

TRANSMITTING CONTROL UNIT REFERENCE CHART

BUS OFF and Internal Error Codes

DTC CHART

DTC Troubleshooting Index

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

1. Battery voltage DTCs
2. Internal error DTCs
3. Loss of communication DTCs (beginning with the lowest number first; for example, if DTC B1005 and B1008 are retrieved, troubleshoot B1008 first).
4. Signal error DTCs

MICU

DTC DESCRIPTION

Relay Control Module

DTC DESCRIPTION

Driver's MPCS Unit (Rear Power Window section)

DTC DESCRIPTION

Gauge Control Module

DTC DESCRIPTION

Climate Control Unit

DTC DESCRIPTION

Combination Switch Control Unit

DTC DESCRIPTION

Keyless Access Control Unit

DTC DESCRIPTION

HandsFreeLink Control Unit

DTC DESCRIPTION

Power Seat Control Unit

DTC DESCRIPTION

Adaptive Front Lighting Control Unit

DTC DESCRIPTION

Driver's MPCS Unit

DTC DESCRIPTION

AcuraLink Control Unit

DTC DESCRIPTION

Diagnostic Trouble Codes (DTC)

There are three types of DTCs used by the CAN networks.

DIAGNOSTIC TROUBLE CODES CHART

Test Mode 1

Do this diagnosis if the HDS is not available.

Scheme 3

1. Check the No. 7 (10 A) and No. 21 (10 A) fuses in the driver's 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»(ref-348548-S12346227902009112400000) ), and the driver's dashboard under cover.
3. Turn the ignition switch to ON (II), and move the interior lights switch to the "DOOR" position.
4. Connect the MPCS service connector (A) to the MCIC socket (B) in the driver's under-dash fuse/ relay box.
5. Wait 5 seconds, and watch the map lights. When the system enters Mode 1, the front and rear map lights will flash quickly once, and a double beep will be heard.
6. If there is a DTC, the map lights and ignition key light will blink, pause, then repeat the DTC as long as the ignition switch is turned to 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-diagnostic Mode 1, the map lights 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 with the DTC with the lowest numerical value. Troubleshoot the DTCs as indicated below: DTC 2, 3, 4 and 5 simultaneously: Check for an open in the LT GRN wire between MICU D11 and relay control module J7, LT GRN wire between MICU N28 and combination switch control unit No. 4, LT GRN wire between MICU J4 and driver's MPCS unit A28, and LT GRN wire between MICU N22 and gauge control module B17. If the wire is OK, substitute a known-good driver's under-dash fuse/relay box, under-hood fuse/relay box, gauge control module, wiper/washer switch, and driver's MPCS unit one at a time, in that order, and recheck for the DTCs after each substitution. DTC 1 only: Go to MICU input test (see «MICU INPUT TEST»(ref-348551-S07511027952009112400000) ). DTC 2 only (no other DTCs present): Go to the relay control module input test (see «RELAY CONTROL MODULE INPUT TEST»(ref-348551-S05108368102009112400000) ). If all inputs are OK, substitute a known-good relay control module and then a 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 driver's MPCS unit input test (see «DRIVER'S MPCS UNIT INPUT TEST»(ref-348551-S34193089842009112400000) ). If all inputs are OK, substitute a known-good driver's MPCS unit and then a 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 (see «COMBINATION SWITCH CONTROL UNIT INPUT TEST»(ref-348551-S09609848952009112400000) ). If all inputs are OK, substitute a known-good wiper/washer switch and then a 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 (see «GAUGE CONTROL MODULE INPUT TEST»(ref-348551-S18270954162009112400000) ). If all inputs are OK, substitute a known-good gauge control module and then a MICU, one at a time, and then check for DTCs. If a DTC recurs after a substitution, replace that unit. DTC DESCRIPTION DTC Cause 1 The MICU cannot receive signals from the BUS communication line. 2 The MICU cannot receive signals from the relay control module communication line. 3 The MICU cannot receive signals from the driver's MPCS communication line. 4 The MICU cannot receive signals 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 (see «GAUGE CONTROL MODULE DTC DISPLAY»(ref-348551-S04590840692009112400000) ). 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 these order: Battery voltage DTCs Internal error DTCs Loss of communication DTCs (begin with the lowest number first; for example, if DTC B1005 and B1008 are retrieved, troubleshoot B1005 first) Signal error DTCs Test Mode 2
11. Remove the MPCS service connector from the driver's under-dash fuse/relay box socket for 5-10 seconds, then re-insert it to enter Mode 2. When the system enters Mode 2, the front and rear map lights will flash two times quickly. NOTE: If the MPCS connector is disconnected for too short or too long of a time, or the ignition switch is turned to LOCK (0), the system will return to Test Mode 1.
12. 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 map lights will blink once. If the circuit is faulty, there will be no indication. MICU ITEM SPECIFICATION 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 security ground (when disconnected) Driver's seat belt buckle switch (unbuckled) Brake pedal position switch (ON; brake pedal pressed) Passenger's door lock switch (LOCK/UNLOCK) Mirror select switch (LEFT, CENTER, RIGHT) Mirror switch (LEFT, RIGHT, UP, DOWN) (1) The front passenger's and door lock knob switches must be in the locked position when beginning the test. RELAY CONTROL MODULE ITEM SPECIFICATION Item Windshield wiper switch (AUTO STOP/PARK) Security hood switch (OPEN) A/C pressure switch/thermal protector (A/C ON) COMBINATION SWITCH CONTROL UNIT ITEM SPECIFICATION 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) DRIVER'S MPCS UNIT ITEM SPECIFICATION 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) Driving position memory switches (1,2, memo) Passenger's window switch (UP) Passenger's window switch (DOWN) Passenger's window switch (AUTO UP) Passenger's window switch (AUTO DOWN) Trunk lid opener switch (ON) Fuel fill door opener switch (ON) (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 ITEM SPECIFICATION Item Parking brake switch (ON; parking brake applied) Cruise control main SET/RESUME/CANCEL switch (ON; switch pressed) Transmission range switch (P, R, N, D) Washer fluid level switch (fluid removed) (Canada models) Brake fluid level switch (fluid removed) Illumination control switches (+, -) MID switches (Select/Reset, < INFO, INFO>) POWER SEAT CONTROL UNIT ITEM SPECIFICATION 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) Power tilt/telescopic steering switch (UP, DOWN, PUSH, PULL) Rear head restraint tilt switch (ON) Do the map lights indicate proper switch operation? YES -Go to function and input test for the system related to the failure. NO -Repair the open, short, or replace the faulty switch.

Scheme 4

Scheme 5

Scheme 6

Scheme 7

MICU Input Test

Note. Before testing, troubleshoot B-CAN System Diagnosis Test Mode A (see TROUBLESHOOTING - B-CAN SYSTEM DIAGNOSIS TEST MODE A ).

Scheme 8

1. Turn the ignition switch to LOCK (0).
2. Remove the left kick panel (see «TRIM REMOVAL/INSTALLATION - DOOR AREAS»(ref-348548-S12346227902009112400000) ).
3. Disconnect the driver's under-dash fuse/relay box connectors. NOTE: All connector views are wire side of female terminals. *Connector view shown rotated 180° from actual position in the under-dash fuse/relay box.
4. Inspect the connector and socket terminals to be sure they are all making good contact. If the terminals are bent, loose or corroded, repair them as necessary and recheck the system. If the terminals look OK, go to step 5.
5. With the connectors still disconnected, make these input tests at the connectors. If any test indicates a problem, find and correct the cause, then recheck the system. If all the input tests prove OK, go to step 6. POSSIBLE CAUSE CHART Cavity Wire Test condition Test: Desired result Possible cause if desired result is not obtained H14 ORN Ignition switch ON (II) Attach to ground: The ignition key light should come on. Blown No. 13 (15 A) fuse in the under-hood fuse/relay box Faulty ignition key light An open in the wire W4 PNK Interior lights switch (in the roof console) DOOR switch pushed Attach to ground: The individual map lights should come on. Blown No. 6 (7.5 A) fuse in the driver's under-dash fuse/relay box Faulty map light Faulty roof console An open in the wire D11 LT GRN Under all conditions (Relay control module connector J (10P) and adaptive front lighting control unit 40P connector disconnected) Check for continuity between the D11 terminal and relay control module connector J (10P) terminal No. 7, and the D11 terminal and adaptive front lighting control unit 40P connector terminal No. 15: There should be continuity. An open in the wire Check for continuity to ground: There should be no continuity. A short to ground in the wire N1 GRY Under all conditions (Power tilt/ telescopic steering control unit connector A (16P) disconnected) Check for continuity between the N1 terminal and power tilt/telescopic steering control unit connector A (16P) terminal No. 11: There should be continuity. An open in the wire Check for continuity to ground: There should be no continuity. A short to ground in the wire N22 LT GRN Under all conditions (Gauge control module connector B (28P) disconnected) Check for continuity between the N22 terminal and gauge control module connector B (28P) terminal No. 17: There should be continuity. An open in the wire Check for continuity to ground: There should be no continuity. A short to ground in the wire N28 LT GRN Under all conditions (Wiper/ washer switch 8P connector disconnected) Check for continuity between the N28 terminal and combination switch control unit 8P connector terminal No. 4: There should be continuity. An open in the wire Check for continuity to ground: There should be no continuity. A short to ground in the wire J4 LT GRN Under all conditions (Driver's MFCS unit connector A (40P) and AcuraLink control unit (XM receiver) connector A (32P) disconnected) Check for continuity between the J4 terminal and driver's MPCS unit connector A (40P) terminal No. 4 and the J4 terminal and AcuraLink control unit (XM receiver) connector A (32P) terminal No. 10: There should be continuity. An open in the wire Check for continuity to ground: There should be no continuity. A short to ground in the wire G1 LT GRN Under all conditions (Power seat control unit connector A (40P) disconnected) Check for continuity between the G1 terminal and power seat control unit connector A (40P) terminal No. 40: There should be continuity. An open in the wire Check for continuity to ground: There should be no continuity. A short to ground in the wire T3 LT GRN Under all conditions (Climate control unit 40P connector disconnected) Check for continuity between the T3 terminal and climate control unit 40P connector terminal No. 24: There should be continuity. An open in the wire Check for continuity to ground: There should be no continuity. A short to ground in the wire X18 LT GRN Under all conditions (Keyless access control unit connector A (31P) disconnected) Check for continuity between the X18 terminal and keyless access control unit connector A (31P) terminal No. 11: There should be continuity. An open in the wire Check for continuity to ground: There should be no continuity. A short to ground in the wire X27 LT GRN Under all conditions (HandsFreeLink control unit connector (28P) disconnected) Check for continuity between the X27 terminal and HandsFreeLink control unit connector (28P) terminal No. 18: There should be continuity. An open in the wire Check for continuity to ground: There should be no continuity. A short to ground in the wire J1 GRY Under all conditions (Driver's MPCS unit connector A (40P), power window master switch 6P connector, and moonroof motor/control unit 10P connector disconnected) Check for continuity between the J1 terminal and driver's MPCS unit connector A (40P) terminal No. 8, H4 terminal and power window master switch 6P connector terminal No. 6, moonroof motor/control unit 10P connector terminal No. 4: There should be continuity. An open in the wire Check for continuity to ground: There should be no continuity. A short to ground in the wire H4 GRY Under all conditions (Left rear power window switch 14P connector disconnected) Check for continuity between the H4 terminal and left rear power window switch 14P connector terminal No. 2: There should be continuity. An open in the wire Check for continuity to ground: There should be no continuity. A short to ground in the wire X15 GRY Under all conditions (Front passenger's MPCS unit connector A (28P) and right rear power window switch 14P connector disconnected) Check for continuity between the X15 terminal and front passenger's MPCS unit connector A (28P) terminal No. 4, and X15 terminal and right rear power window switch 14P connector terminal No. 2: There should be continuity. An open in the wire Check for continuity to ground: There should be no continuity. A short to ground in the wire
6. Reconnect the connectors to the MICU, and make these input tests at the connectors. If any test indicates a problem, find and correct the cause, then recheck the system. If all the input tests prove OK, the MICU must be faulty, replace the driver's under-dash fuse/relay box (see «DRIVER'S UNDER-DASH FUSE/RELAY BOX (MICU) REMOVAL/INSTALLATION»(ref-348561-S13182418392009112400000) ). TEST CONDITION CHART Cavity Wire Test condition Test: Desired result Possible cause if desired result is not obtained P1 BRN Under all conditions Measure the voltage to ground: There should be less than 0.1 V. Poor ground (G502) An open in the wire E9 BLK Under all conditions Measure the voltage to ground: There should be less than 0.1 V. Poor ground (G601) An open in the wire H9 BLK Under all conditions Measure the voltage to ground: There should be less than 0.1 V. Poor ground (G601) An open in the wire Q14 BLK Under all conditions Measure the voltage to ground: There should be less than 0.1 V. Poor ground (G601) An open in the wire
7. If multiple failures are found on more than one control unit, replace the driver's under-dash fuse/relay box (includes the MICU) (see «DRIVER'S UNDER-DASH FUSE/RELAY BOX (MICU) REMOVAL/INSTALLATION»(ref-348561-S13182418392009112400000) ). If input failures are related to a particular control unit, replace the control unit.

Gauge Control Module Input Test

Note. Before testing, troubleshoot B-CAN System Diagnosis Test Mode A (see TROUBLESHOOTING - B-CAN SYSTEM DIAGNOSIS TEST MODE A ).

Scheme 9

1. Turn the ignition switch to LOCK (0).
2. Remove the gauge control module (see «GAUGE CONTROL MODULE REPLACEMENT»(ref-348531-S01087065272009112400000) ).
3. Disconnect gauge control module connectors A (20P) and B (28P).
4. Inspect the connector and socket terminals to be sure they are all making good contact. If the terminals are bent, loose or corroded, repair them as necessary and recheck the system. If the terminals look OK, go to step 5.
5. Reconnect the connectors to the gauge control module, and make these input tests at the connectors. If any test indicates a problem, find and correct the cause, then recheck the system. If all the input tests prove OK, go to step 6. TEST CONDITION CHART Cavity Wire Test condition Test: Desired result Possible cause if desired result is not obtained A7 BLK Under all conditions Measure the voltage to ground: There should be less than 0.1 V. Poor ground(G501) An open in the wire A8 BLK Under all conditions Measure the voltage to ground: There should be less than 0.1 V. Poor ground(G501) An open in the wire B1 PNK Ignition switch ON (II) Measure the voltage to ground: There should be battery voltage. Blown No. 21 (10 A) fuse in the driver's under-dash fuse/relay box An open in the wire B2 WHT Under all conditions Measure the voltage to ground: There should be battery voltage. Blown No. 15 (40 A) fuse in the under-hood fuse/relay box Blown No. 7 (10 A) fuse in the driver's under-dash fuse/relay box An open in the wire
6. Disconnect gauge control module connectors A (20P) and B (28P), and make these input tests at the connectors. If any test indicates a problem, find and correct the cause, then recheck the system. If all the input tests prove OK, replace the gauge control module (see «GAUGE CONTROL MODULE REPLACEMENT»(ref-348531-S01087065272009112400000) ). TEST CONDITION CHART Cavity Wire Test condition Test: Desired result Possible cause if desired result is not obtained B17 LT GRN Driver's under-dash fuse/relay box connector N (45P) disconnected Check for continuity between the B17 terminal and driver's under-dash fuse/relay box connector N (45P) terminal No. 22: There should be continuity. An open in the wire Check for continuity to ground: There should be no continuity. A short to ground in the wire

Combination Switch Control Unit Input Test

Note. Before testing, troubleshoot B-CAN System Diagnosis Test Mode A (see TROUBLESHOOTING - B-CAN SYSTEM DIAGNOSIS TEST MODE A ).

Scheme 10

1. Turn the ignition switch to LOCK(O), remove the driver's dashboard undercover (see «DRIVER'S DASHBOARD LOWER COVER REMOVAL/INSTALLATION»(ref-348558-S41752548762009112400000) ), and the driver's dashboard lower cover (see «DRIVER'S DASHBOARD LOWER COVER REMOVAL/INSTALLATION»(ref-348558-S41752548762009112400000) ), then remove the steering column covers (see «STEERING COLUMN REMOVAL AND INSTALLATION»(ref-348511-S08332992362009112400000) ).
2. Disconnect the 8P connector from the wiper/washer switch (combination switch control unit).
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, 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. TEST CONDITION 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 0.1 V. Poor ground(G501) An open in the wire 8 WHT Under all conditions Measure the voltage to ground: There should be battery voltage. Blown No. 15 (40 A) fuse in the under-hood fuse/relay box Blown No. 7 (10 A) fuse in the driver's under-dash fuse/relay box An open in the wire 7 PNK Ignition switch ON (II) Measure the voltage to ground: There should be battery voltage. Blown No. 21 (10 A) fuse in the driver's under-dash fuse/relay box An open in the wire
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. TEST CONDITION CHART Cavity Wire Test condition Test: Desired result Possible cause if desired result is not obtained 4 LT GRN Under all conditions Check for continuity between No. 4 terminal and driver's under-dash fuse/relay box connector N (45P) terminal No. 28: There should be continuity. An open in the wire Under all conditions (Driver's under-dash fuse/relay box connector N (45P) disconnected) Check for continuity to ground: There should be no continuity. A short to ground in the wire

Relay Control Module Input Test

Note. Before testing, troubleshoot B-CAN System Diagnosis Test Mode A (see TROUBLESHOOTING - B-CAN SYSTEM DIAGNOSIS TEST MODE A ).

Scheme 11

1. Turn the ignition switch to LOCK(O), and remove the under-hood fuse/relay box under cover (see «REMOVAL AND INSTALLATION»(ref-348549-S36817590512009112400000) ).
2. Disconnect under-hood fuse/relay box connector J (10P).
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. TEST CONDITION CHART Cavity Wire Test condition Test: Desired result Possible cause if desired result is not obtained J10 BLK Under all conditions Measure the voltage to ground: There should be less than 0.1 V. Poor ground(G301) An open in the wire J8 YEL Ignition switch ON (II) Measure the voltage to ground: There should be battery voltage. Blown No. 21 (10 A) fuse in the driver's under-dash fuse/relay box An open in the wire
5. Disconnect under-hood fuse/relay box connector J (10P), 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 (see «REMOVAL AND INSTALLATION»(ref-348549-S36817590512009112400000) ). TEST CONDITION CHART Cavity Wire Test condition Test: Desired result Possible cause if desired result is not obtained J7 LT GRN Under all conditions Check for continuity between J7 terminal and driver's under-dash fuse/relay box connector D (17P) terminal No. 11: There should be continuity. An open in the wire Under all conditions (Driver's under-dash fuse/relay box connector D (17P) disconnected) Check for continuity to ground: There should be no continuity. A short to ground in the wire

Driver's MPCS Unit Input Test

Note. Before testing, troubleshoot B-CAN System Diagnosis Test Mode A (see TROUBLESHOOTING - B-CAN SYSTEM DIAGNOSIS TEST MODE A ).

Scheme 12

1. Turn the ignition switch to LOCK (0).
2. Remove the driver's door panel (see «FRONT DOOR PANEL REMOVAL/INSTALLATION»(ref-348568-S32747857942009112400000) ).
3. Disconnect driver's MPCS unit connector A (40P).
4. Inspect the connector and socket terminals to be sure they are all making good contact. If the terminals are bent, loose or corroded, repair them as necessary and recheck the system. If the terminals look OK, go to step 5.
5. Reconnect the connector to the driver's MPCS unit, 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 6. TEST CONDITION CHART Cavity Wire Test condition Test: Desired result Possible cause if desired result is not obtained A5 BLK Under all conditions Measure the voltage to ground: There should be less than 0.1 V. Poor ground(G601) An open in the wire A7 WHT Under all conditions Measure the voltage to ground: There should be battery voltage. Blown No. 15 (40 A) fuse in the under-hood fuse/relay box Blown No. 7 (10 A) fuse in the driver's under-dash fuse/relay box An open in the wire A25 YEL Ignition switch ON (II) Measure the voltage to ground: There should be battery voltage. Blown No. 21 (10 A) fuse in the driver's under-dash fuse/relay box An open in the wire
6. Disconnect driver's MPCS connector A (40P), 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 driver's MPCS unit must be faulty, replace it. TEST CONDITION CHART Cavity Wire Test condition Test: Desired result Possible cause if desired result is not obtained A8 GRY Under all conditions (Driver's under-dash fuse/relay box connector J (21P), power window master switch 6P connector, and moonroof motor/control unit 10P connector disconnected) Check for continuity between the A8 terminal and driver's under-dash fuse/relay box connector J (21P) terminal No. 1, A8 terminal and power window master switch 6P connector No. 6 terminal, and A8 terminal and moonroof motor/control unit 10P connector terminal No. 4: There should be continuity. An open in the wire Check for continuity to ground: There should be no continuity. A short to ground in the wire A28 LT GRN Under all conditions (Driver's under-dash fuse/relay box connector J (21P)and AcuraLink control unit (XM receiver) connector A (32P) disconnected) Check for continuity between the A28 terminal and driver's under-dash fuse/relay box connector J (21P) terminal No. 4, and A8 terminal and AcuraLink control unit (XM receiver) connector A (32P) terminal No. 10: There should be continuity. An open in the wire Check for continuity to ground: There should be no continuity. A short to ground in the wire