Multiplex Intergrated Control System: Diagnosis Honda Ridgeline I

Troubleshooting CAN Circuit Related Problems

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

How to clear the DTC

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

Loss of Communication DTC cross-reference chart

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

1. Find the Transmitting Control Unit that is in the same row as all of the loss of communication DTCs retrieved.
2. Perform the input test for the transmitting control unit. BUS OFF AND INTERNAL ERROR CODES DTC Type Related Unit MICU Relay Control Module Door Multiplex Control Unit Combination Switch Control Unit Gauge Control Module HVAC Control Unit or Climate Control Unit BUS OFF B1000 B1050 B1100 B1250 B1150 B1200 ECU (CPU) Error B1001 ECU (EEPROM) Error B1002 B1102 B1152 B1202 DTC CROSS-REFERENCE CHART Transmitting Control Unit Message Receiving Unit/Loss of Communication DTC MICU Relay Control Module Door Multiplex Control Unit Combination Switch Control Unit Gauge Control Module HVAC Control Unit or Climate Control Unit MICU ALARM B1056 MICU B1055 B1106 B1255 B1157 DOOR SWITCH B1057 B1105 B1159 Relay Control Module RELAY CONTROL MODULE B1005 B1158 Door Multiplex Control Unit PANIC B1010 B1059 DRIVER'S DOOR LOCK SWITCH B1006 B1058 B1160 Combination Switch Control Unit HEADLIGHT SWITCH B1007 B1062 B1155 WIPER SWITCH B1063 B1156 Gauge Control Module VSP/NE B1011 B1060 B1205 A/T B1008 B1061 ENGTEP B1206 PCM ENG B1168 AT B1169 TPMS Control Unit TPMS B1173 VSA Modulator-control Unit VSA B1170

DTC Troubleshooting Index

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

1. Battery voltage DTCs
2. Internal error DTCs
3. Loss of communication DTCs (beginning with the lowest number first; for example, if B1006 and B1059 are retrieved, troubleshoot B1006 first).
4. Signal error DTCs

DTC TROUBLESHOOTING INDEX

Diagnostic Trouble Codes (DTC)

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

DIAGNOSTIC TROUBLE CODES

Test Mode 1

Check the PCM for DTCs and troubleshoot PCM or F-CAN loss of communication errors first (see GENERAL TROUBLESHOOTING INFORMATION ), then perform this diagnosis if the HDS is not available.

Scheme 3

1. Check the No. 7 (7.5 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»(ref-219981-S27805053412006021600000) ).
3. Turn the ignition switch ON (II), and move the interior lights switch to the middle (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 front and rear map lights flash quickly once, and then go off, the system is in Test Mode 1.
6. Check for B-CAN DTCs indicated by the gauge control module odometer/trip meter display while still in Test Mode 1. Push the odometer trip meter select/switch button to display the next code. After you get to the last code, the display shows END. If no DTCs are stored, the display will read NO. Are any DTCs indicated? YES - Go to step 7 . NO - Go to step 10 .
7. Record all DTCs and sort them.
8. Troubleshoot the DTCs in this order: Battery voltage DTCs Internal error DTCs Loss of communication DTCs (begin with the lowest number first; for example, if B1006 and B1059 are retrieved, troubleshoot B1006 first) Signal error DTCs
9. Clear the DTCs by pressing and holding the select/reset knob for about 13 seconds. You will hear a beep to confirm the code have been cleared. Operate the devices that failed, and recheck for codes.
10. 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 and then go off. NOTE: If the MPCS connector is disconnected for too short or too long of a time, or the ignition switch is turned OFF, the system will return to Test Mode 1.
11. The following tables list the circuits that can be checked in Test Mode 2. Operate the switch that is most closely related to the problem. If the circuit is OK, the map lights will blink once. If the circuit is faulty, there will be no indication. MICU Item Driver's door switch (OPEN) Front passenger's door switch (OPEN) Left rear door switch (OPEN) Right rear door switch (OPEN) Ignition key switch (inserted) Front passenger's door lock knob switch (UNLOCK) Left rear door lock knob switch (UNLOCK) (1) Right rear door lock knob switch (UNLOCK) (1) Audio security ground (disconnected) Driver's seat belt switch (unbuckled) Brake pedal position switch (ON; brake pedal pressed) Tailgate switch (OPEN) In-Bed trunk lid key cylinder switch (OPEN) In-Bed trunk lid key cylinder switch (1) With security RELAY CONTROL MODULE Item Windshield wiper switch (AUTO STOP/PARK) Hood switch (open) (1) A/C pressure switch/thermal protector (A/C ON) (1) With security COMBINATION SWITCH CONTROL UNIT 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) 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) Passenger's power window switch Passenger's power window switch (UP) Passenger's power window switch (DOWN) (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 Parking brake switch (ON; parking brake applied) Cruise control main SET/RESUME/CANCEL switch (ON; switch pressed) Gauge illumination full bright Select switch button (ON) Reset switch button (ON) Transmission range switch (P, R, N, D) Washer fluid level switch (fluid removed) Brake fluid level switch (fluid removed) VSA switch Cargo switch 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

DTC Troubleshooting

DTC INDEX

MICU Input Test

Note. Make sure the ignition switch is OFF before troubleshooting the under-dash fuse/relay box connectors.

Scheme 6

Scheme 7

1. Before troubleshooting the multiplex integrated control system, troubleshoot the B-CAN System Diagnosis Test mode A (see «Troubleshooting - B-CAN System Diagnosis Test Mode A»(ref-220008-S38172144952006021600000) ).
2. Turn the ignition switch OFF.
3. Remove the left front door sill trim and left side kick panel (see «TRIM REMOVAL/INSTALLATION - DOOR AREAS»(ref-219981-S27805053412006021600000) ).
4. Disconnect the under-dash fuse/relay box connectors. NOTE: All connector views are wire side of female terminals.
5. 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.
6. With the connectors still disconnected from the under-dash 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. TEST CONDITION (1 OF 6) Cavity Wire Test condition Test: Desired result Possible cause if result is not obtained P7 WHT/BLK Under all conditions Attach to ground: The ignition key light should come on. Blown No. 7 (7.5 A) fuse in the under-dash fuse/relay box Faulty LED An open in the wire W4 BLU/RED Interior lights switch in the middle position, all doors closed Attach to ground: The individual map lights should come on. Blown No. 6 (10 A) fuse in the under-dash fuse/relay box Faulty map light An open in the wire D11 BLU Under all conditions Check for continuity between the D11 terminal and the relay control module connector J (10P) No. 8 terminal: There should be continuity. An open in the wire Relay control module connector J (10P) disconnected Check for continuity to ground: There should be no continuity. Short to ground J4 BRN/BLK Under all conditions Check for continuity between the J4 terminal and the power window master switch connector (23P) No. 16 terminal: There should be continuity. An open in the wire Power window master switch (Door multiplex control unit) connector (23P) disconnected Check for continuity to ground: There should be no continuity. Short to ground N22 LTBLU Under all conditions Check for continuity between the N22 terminal and the HVAC control unit connector (30P) No. 11 terminal (or climate control unit) connector (30P) No. 30 terminal: There should be continuity. An open in the wire HVAC control unit (or climate control unit) connector (30P) disconnected Check for continuity to ground: There should be no continuity. Short to ground N28 BRN/YEL Under all conditions Check for continuity between the N28 terminal and the gauge control module connector B (14P) No. 6 terminal: There should be continuity. An open in the wire Gauge control module connector B (14P) disconnected Check for continuity to ground: There should be no continuity. Short to ground X27 LT GRN Under all conditions Check for continuity between the X27 terminal and the combination switch connector (12P) No. 3 terminal: There should be continuity. An open in the wire Combination switch connector (12P) disconnected Check for continuity to ground: There should be no continuity. Short to ground
7. Reconnect the connectors to the driver's under-dash fuse/relay box, and make sure these input tests at the appropriate connectors on the driver's 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 MICU must be faulty, replace the driver's under-dash fuse/relay box assembly. TEST CONDITION (2 OF 6) Cavity Wire Test condition Test: Desired result Possible cause if result is not obtained E9 H9 BLK Under all conditions Check for continuity to ground: There should be continuity. Poor ground (G501) An open in the wire P1 BLK Under all conditions Check for continuity to ground: There should be continuity. Poor ground (G403) An open in the wire D6 J9 X34 YEL Ignition switch ON (II) Check for 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 K5 X35 WHT/RED Under all conditions Check for voltage to ground: There should be battery voltage. Blown No. 7 (7.5 A) fuse in the under-dash fuse/relay box An open in the wire

Gauge Control Module Input Test

Note. Check the No. 22 (120 A), No. 23 (50 A), No. 15 (40 A) fuse in the under-hood fuse/relay box before troubleshooting.

Scheme 8

1. Before troubleshooting the multiplex integrated control system, troubleshoot the B-CAN System Diagnosis Test mode A (see «Troubleshooting - B-CAN System Diagnosis Test Mode A»(ref-220008-S38172144952006021600000) ).
2. Turn the ignition switch OFF.
3. Remove the gauge control module (see «GAUGE CONTROL MODULE REPLACEMENT»(ref-299654-S04490491472008092500000) ).
4. Disconnect connectors from the gauge control module.
5. 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 6 . NOTE: All connectors are wire side of female terminals.
6. Reconnect connector A and C 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, replace the gauge control module. TEST CONDITION (3 OF 6) Cavity Wire Test Condition Test: Desired result Possible cause if result is not obtained C10 BLK Under all conditions Check for voltage to ground: There should be less than 1 V. Poor ground (G402) An open in the wire A19 WHT/RED Under all conditions Check for voltage to ground: There should be battery voltage. Blown No. 7 (7.5 A) fuse in the under-dash fuse/relay box An open in the wire A20 YEL Ignition switch ON (II) Check for 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 B6 BRN/YEL Under all conditions Check for continuity between the B6 terminal and the under-dash fuse/relay box connector N (45P) No. 28 terminal: There should be continuity. An open in the wire

Door Multiplex Control Unit Input Test

Note. Check the No. 22 (120 A), No. 23 (50 A), No. 15 (40 A) fuse in the under-hood fuse/relay box before troubleshooting.

Scheme 9

1. Before troubleshooting the multiplex integrated control system, troubleshoot the B-CAN System Diagnosis Test mode A (see «Troubleshooting - B-CAN System Diagnosis Test Mode A»(ref-220008-S38172144952006021600000) ).
2. Turn the ignition switch OFF.
3. Remove the power window master switch (see «PASSENGER'S POWER WINDOW MOTOR TEST»(ref-299655-S06935710302008092500000) ).
4. Disconnect the 23P connector from the power window master switch.
5. 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 6 .
6. With the connector still disconnected, make these input tests at the connector. If the test indicates a problem, find and correct the cause, then recheck the system. If the terminals look OK, go to step 7 . Cavity Wire Test condition Test: Desired result Possible cause if result is not obtained 16 BRN/BLK Under all conditions Check for continuity between No. 16 terminal and the under-dash fuse/relay box connector J (21P) No. 4 terminal: There should be continuity. An open in the wire
7. Reconnect the connector to the door multiplex control 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, the door multiplex control unit must be faulty, replace the power window master switch. TEST CONDITION (4 OF 6) Cavity Wire Test condition Test: Desired result Possible cause if result is not obtained 1 BLK Under all conditions Check for voltage to ground: There should be less than 1 V. Poor ground (G501) An open in the wire 15 WHT/RED Under all conditions Check for voltage to ground: There should be battery voltage. Blown No. 7 (7.5 A) fuse in the under-dash fuse/relay box An open in the wire 20 YEL Ignition switch ON (II) Check for 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

Combination Switch Control Unit Input Test

Note. Check the No. 22 (120 A), No. 23 (50 A), No. 15 (40 A) fuse in the under-hood fuse/relay box before troubleshooting.

Scheme 10

1. Before troubleshooting the multiplex integrated control system, troubleshoot the B-CAN System Diagnosis Test mode A (see «Troubleshooting - B-CAN System Diagnosis Test Mode A»(ref-220008-S38172144952006021600000) ).
2. Turn the ignition switch OFF.
3. Remove the steering column covers (see «STEERING COLUMN REMOVAL AND INSTALLATION»(ref-219970-S13148840332006021600000) ).
4. Disconnect the 12P connector from the combination switch
5. 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 6 .
6. Reconnect all the connector to the control 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, the combination switch control unit must be faulty, replace the combination switch. TEST CONDITION (5 OF 6) Cavity Wire Test condition Test: Desired result Possible cause if result is not obtained 12 BLK Under all conditions Check for voltage to ground: There should be less than 1 V. Poor ground (G401) An open in the wire 7 WHT/RED Under all conditions Check for voltage to ground: There should be battery voltage. Blown No. 7 (7.5 A) fuse in the under-dash fuse/relay box An open in the wire 1 YEL Ignition switch ON (II) Check for 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 3 LT GRN Under all conditions Check for continuity between No. 3 terminal and the under-dash fuse/relay box connector X (39P) No. 27 terminal: There should be continuity. An open in the wire

Relay Control Module Input Test

Note. Check the No. 22 (120 A), No. 23 (50 A), No. 15 (40 A) fuse in the under-hood fuse/relay box before troubleshooting.

Scheme 11

1. Before troubleshooting the multiplex integrated control system, troubleshoot the B-CAN System Diagnosis Test mode A (see «Troubleshooting - B-CAN System Diagnosis Test Mode A»(ref-220008-S38172144952006021600000) ).
2. Turn the ignition switch OFF.
3. Check the No. 7 (7.5 A) fuse in the under-hood fuse/relay box.
4. Remove the underhood fuse/relay box under cover (see «REMOVAL AND INSTALLATION»(ref-220003-S09253066142006021600000) ).
5. Disconnect the underhood fuse/relay box connector J (10P).
6. 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 7 .
7. Reconnect the connector to the underhood 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 underhood fuse/relay box. TEST CONDITION (6 OF 6) Cavity Wire Test condition Test: Desired result Possible cause if result is not obtained J9 J10 BLK Under all conditions Check for voltage to ground: There should be less than 1 V. Poor ground (G202) An open in the wire J2 YEL Ignition switch ON (II) Check for 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 J8 BLU Under all conditions Check for continuity between J8 terminal and the driver's under-dash fuse/relay box connector D (17P) No. 11 terminal: There should be continuity. An open in the wire