Multiplex Integrated Control System (V6): Diagnosis Honda Crosstour I

Troubleshooting CAN Circuit Related Problems

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

Using the 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 ).
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 (see «DTC U1280: COMMUNICATION BUS LINE ERROR (BUS-OFF)»(ref-360108-S26430207752010042600000) ) first. 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 ).

How To Clear The DTC

1. Enter B-CAN System Diagnosis Test Mode 1 (see ).
2. Press and hold down the SEL/RESET button for at least 10 seconds.

Loss of Communication DTC Cross-Reference Chart

When an ECU on the CAN circuit is unable to communicate with 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 with the other control units on the CAN circuit.

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 DTC CHART DTC Type Related Unit Driver's MICU Passenger's MICU Gauge Control Module Door Multiplex Control Unit Immobilizer-Keyless Control Unit Climate Control Unit HandsFreeLink Control Unit Power Seat Control Unit BUS OFF U1280 U1280 U1280 U1280 U1280 U1280 U1280 U1280 ECU (EEPROM) Error B10A2 B11A2 B1152 B1802 Loss of Communication COMMUNICATION CHART Transmitting Control Unit Receiving Unit/Loss of Communication DTC Driver's MICU Passenger's MICU Gauge Control Module Door Multiplex Control Unit Immobilizer-Keyless Control Unit Climate Control Unit Power Seat Control Unit Driver's MICU TX U1282 U1282 U1282 U1282 - U1282 Passenger's MICU U1283 TX U1283 U1283 - - - Gauge Control Module U0155 U0155 TX U0155 U0155 U0155 U128D Door Multiplex Control Unit U0199 - - TX U0199 - U0199 Climate Control Unit - - - U0164 - - - PCM - - U0100 - - - - SRS Unit - - U0151 - - - - VSA Modulator Control Unit - - U0122 - - - - TPMS Control Unit - - U0127 - - - - TX: Transmitting unit does not set a loss communication DTC.

DTC Troubleshooting Index

Note. Record all DTCs, and sort them by DTC type using the DTC troubleshooting index, then troubleshoot the DTC(s) in this order: Battery voltage DTCs Internal error DTCs Loss of communication DTCs Signal error DTCs

Driver's MICU

DTC DESCRIPTION

Passenger's MICU

DTC DESCRIPTION

Immobilizer-keyless Control Unit

DTC DESCRIPTION

Door Multiplex Control Unit

DTC DESCRIPTION

Gauge Control Module

DTC DESCRIPTION

HandsFreeLink Control Unit

DTC DESCRIPTION

Climate Control Unit

DTC DESCRIPTION

Power Seat Control Unit

DTC DESCRIPTION

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 further inputs listed below, it will go into sleep mode in less than 40 seconds. IG1 power supply IG2 power supply B-CAN data Tailgate latch switch (Tailgate closed) (OFF) Hazard warning switch (OFF)
2. Confirm the sleep mode: NOTE: Check any official Honda service website for more information about parasitic draw at the battery. Measure the voltage on the B-CAN communication line (PNK and BLU wires); there should be battery voltage in the sleep mode. Check the parasitic draw at the battery while shifting into the sleep mode; amperage should change from about 200 mA to less than 35 mA in less than 40 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 PCM wake up at the same time without "talking" to each other through the communication lines. When any switch in the multiplex integrated control system is turned on, it wakes up its related control unit which, in turn, wakes up the other units. After confirming the sleep mode, look in the following table for the switch most related to the problem. Operate that switch and see if its control unit wakes up. NOTE: If any control unit is faulty and will not wake up, several circuits in the system will malfunction at the same time. In the table below, the control unit is followed by a list of the switches and input signals that can wake it up. IG1 power supply IG2 power supply B-CAN data Driver's door switch (door open) Left rear door switch (door 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, Fog ON) Ignition key switch (key inserted)

Scheme 5

Scheme 6

DTC B10A2: Driver's MICU Internal (EEPROM) Error

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

1. Clear the DTCs with the HDS.
2. Turn the ignition switch to LOCK (0) and then back to ON (II).
3. Wait for at least 6 seconds.
4. 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»(ref-360103-S08550671172010042600000) ), Canada models (see «CANADA MODELS»(ref-360103-S33586290172010042600000) ). NO -Intermittent failure, the system is OK at this time.

DTC B11A2: Passenger's MICU Internal (EEPROM) Error

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

1. Clear the DTCs with the HDS.
2. Turn the ignition switch to LOCK (0) and then back 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»(ref-360103-S12021494872010042600000) ). NO -Intermittent failure, the system is OK at this time.

Note. If your troubleshooting multiple DTCs, be sure to follow the instructions in the 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»(ref-360103-S12021494872010042600000) ). NO -Intermittent failure, the system is OK at this time.

DTC B11C7: Passenger's MICU IG1 Line Input Error

Note. Before troubleshooting, check the No. B5 (7.5 A) fuse in the driver's under-dash fuse/relay box. 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 7

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 B11C7 indicated? YES -go to next step. 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»(ref-360074-S18632198282010042600000) ) and the charging system.
5. Check the DTCs with the HDS. Is DTC B11C7 indicated with DTC U1282? YES -Go to «DTC U1282 TROUBLESHOOTING»(ref-360108-S12172205982010042600000) . NO -Go to next step.
6. Measure the voltage between passenger's under-dash fuse/relay box connector A (38P) terminal No. 28 and body ground. Is there battery voltage? YES -Faulty passenger's MICU; substitute a known-good passenger's under-dash fuse/relay box and recheck. NO -Repair an open or high resistance in the wire between the passenger's under-dash fuse/relay box and driver's under-dash fuse/relay box.

MICU Input Test

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

Driver's MICU

Scheme 8

Scheme 9

1. Turn the ignition switch to LOCK (0), and remove the driver's dashboard lower cover (see «DRIVER'S DASHBOARD LOWER COVER REMOVAL/INSTALLATION»(ref-360087-S09401553722010042600000) ).
2. Remove the driver's dashboard lower cover (see «DRIVER'S DASHBOARD LOWER COVER REMOVAL/INSTALLATION»(ref-360087-S09401553722010042600000) ).
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 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 next step.
5. With the connectors still disconnected, 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 next step. POSSIBLE CAUSE CHART Cavity Wire Test condition Test: Desired result Possible cause if desired result is not obtained P6 BLU Immobilizer-keyless control unit 7P connector disconnected Check for continuity between terminal P6 and immobilizer-keyless control unit 7P connector terminal No. 5: There should be continuity. An open in the B-CAN wire P5 PNK Check for continuity between terminal P5 and immobilizer-keyless control unit 7P connector terminal No. 4: There should be continuity. An open in the B-CAN wire P6 BLU Gauge control module 32P connector disconnected Check for continuity between terminal P6 and gauge control module 32P connector terminal No. 31: There should be continuity. An open in the B-CAN wire P5 PNK Check for continuity between terminal P5 and gauge control module 32P connector terminal No. 30: There should be continuity. An open in the B-CAN wire P6 BLU Door multiplex control unit 37P connector disconnected Check for continuity between terminal P6 and door multiplex control unit 37P connector terminal No. 30: There should be continuity. An open in the B-CAN wire P5 PNK Check for continuity between terminal P6 and door multiplex control unit 37P connector terminal No. 28: There should be continuity. An open in the B-CAN wire P6 BLU Passenger's under-dash fuse/relay box connector A (38P) disconnected Check for continuity between terminal P6 and passenger's under-dash fuse/relay box connector A (38P) terminal No. 34: There should be continuity. An open in the B-CAN wire P5 PNK Check for continuity between terminal P5 and passenger's under-dash fuse/relay box connector A (38P) terminal No. 21: There should be continuity. An open in the B-CAN wire P6 BLU Climate control unit connector B(12P) disconnected Check for continuity between terminal P6 and climate control unit connector B (12P) terminal No. 5: There should be continuity. An open in the B-CAN wire P5 PNK Check for continuity between terminal P5 and climate control unit connector B (12P) terminal No. 6: There should be continuity. An open in the B-CAN wire P6 BLU Audio unit connector B (20P) (1) disconnected Check for continuity between terminal P6 and audio unit connector B (20P) terminal No. 3: There should be continuity. An open in the B-CAN wire P5 PNK Check for continuity between terminal P5 and audio unit connector B (20P) terminal No. 13: There should be continuity. An open in the B-CAN wire P6 BLU HandsFreeLink control unit 28P connector (2) disconnected Check for continuity between terminal P6 and HandsFreeLink control unit 28P connector terminal No. 26: There should be continuity. An open in the B-CAN wire P5 PNK Check for continuity between terminal P5 and HandsFreeLink control unit 28P connector terminal No. 25: There should be continuity. An open in the B-CAN wire P6 BLU Power seat control unit connector B (40P) (2) disconnected Check for continuity between terminal P6 and power seat control unit connector B (40P) terminal No. 22: There should be continuity. An open in the B-CAN wire P5 PNK Check for continuity between terminal P5 and power seat control unit connector B (40P) terminal No. 21: There should be continuity. An open in the B-CAN wire Q15 LT BLU Under all conditions Check for continuity between terminal Q15 and data link connector 16P connector terminal No. 7: There should be continuity. An open in the K-LINE wire (1) With HandsFreeLink (2) With DPMS
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 next step. NOTE: These are power and ground tests for the multiplex integrated control unit. POSSIBLE CAUSE CHART Cavity Wire Test condition Test: Desired result Possible cause if desired result is not obtained F16 WHT Under All Conditions Measure the voltage to ground: There should be battery voltage. Blown No. A15 (10A) fuse in the under-hood fuse/relay box. an open or high resistance in the wire P2 WHT Under all conditions Measure the voltage to ground: There should be battery voltage. Blown No. A15 (10A) fuse in under hood fuse relay box. Faulty driver's under dash fuse/relay box An open or high resistance in the ground wire P9 BRN Ignition switch ON (II) Measure the voltage to ground there should be battery voltage Blown No. B5 (7.5A) 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 N15 BLK In all ignition switch positions Measure the voltage to ground: There should be less than 0.2 V. Poor ground(G402) An open or high resistance in the ground wire Q10 BLK In all ignition switch positions Measure the voltage to ground: There should be less than 0.2 V. Poor ground(G402) An open or high resistance in the ground wire Q9 BRN In all ignition switch positions Measure the voltage to ground: There should be less than 0.2 V. Poor ground(G401) An open or high resistance in the ground wire R11 BRN In all ignition switch positions Measure the voltage to ground: There should be less than 0.2 V. Poor ground(G401) An open or high resistance in the ground wire R8 BLK In all ignition switch positions Measure the voltage to ground: There should be less than 0.2 V. Poor ground(G402) An open or high resistance in the ground wire P2 WHT Under all conditions Measure the voltage to ground: There should be battery voltage. Blown No. A15 (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 P9 BRN Ignition switch ON (II) Measure the voltage to ground: There should be battery voltage. Blown No. B5 (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 Passenger's MICU
7. Turn the ignition switch to LOCK (0).
8. Remove the passenger's kick panel (see «TRIM REMOVAL/INSTALLATION - DOOR AREAS»(ref-360104-S22618986532010042600000) ).
9. Disconnect passenger's under-dash fuse/relay box connectors A and E. NOTE: All connector views are wire side of female terminals.
10. 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 next step.
11. 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 next step. POSSIBLE CAUSE CHART Cavity Wire Test condition Test: Desired result Possible cause if desired result is not obtained A18 WHT Under all conditions Measure the voltage to ground: There should be battery voltage. Blown No. A15 (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 A28 BRN Ignition switch ON (II) Measure the voltage to ground: There should be battery voltage. Blown No. B5 (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 A26 BLK In all ignition switch positions Measure the voltage to ground: There should be less than 0.2 V. Poor ground (G405) An open or high resistance in the ground wire E15 BLK In all ignition switch positions Measure the voltage to ground: There should be less than 0.2 V. Poor ground (G203) An open or high resistance in the ground wire E14 BLK In all ignition switch positions Measure the voltage to ground: There should be less than 0.2 V. Poor ground(G203) An open or high resistance in the ground wire
12. 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»(ref-360103-S08550671172010042600000) ) Canada models (see «CANADA MODELS»(ref-360103-S33586290172010042600000) ) If input failures are related to a particular control unit, replace the control unit.