MICU Input Test (2017 2018 2019)
NOTE:
- Before testing, check for DTCs. If any DTCs are indicated, troubleshoot those DTCs first.
- If you are troubleshooting multiple DTCs, be sure to follow the instructions in B-CAN System Diagnosis Test Mode A .
- Before testing, make sure the fuses associated with the system is OK.
1. Turn the vehicle to the OFF (LOCK) mode.
2. Disconnect under-dash fuse/relay box connectors.
UNDER-DASH FUSE/RELAY BOX CONNECTOR D (44P) (female terminals):
UNDER-DASH FUSE/RELAY BOX CONNECTOR M (12P) (female terminals):
UNDER-DASH FUSE/RELAY BOX CONNECTOR P (24P) (female terminals):
UNDER-DASH FUSE/RELAY BOX CONNECTOR R (16P) (female terminals):
3. Inspect the connectors 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 are OK, go to step 4.
4. 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 step 5.
| Cavity | Wire | Test condition | Test: Desired result | Possible cause if desired result is not obtained |
|---|---|---|---|---|
| M7 | WHT | Disconnect the power window master switch 37P connector | Check for continuity between terminal M7 and power window master switch 37P connector terminal No. 28: There should be continuity. | An open in the B-CAN wire |
| M1 | TAN | Check for continuity between terminal M1 and power window master switch 37P connector terminal No. 30: There should be continuity. | ||
| M7* 1 | WHT | Disconnect audio unit connector B (20P) | Check for continuity between terminal M7 and audio unit connector B (20P) terminal No. 13: There should be continuity. | An open in the B-CAN wire |
| M1* 1 | TAN | Check for continuity between terminal M1 and audio unit connector B (20P) terminal No. 3: There should be continuity. | ||
| M7* 2 | WHT | Disconnect audio unit connector C (24P) | Check for continuity between terminal M7 and audio unit connector C (24P) terminal No. 24: There should be continuity. | An open in the B-CAN wire |
| M1* 2 | TAN | Check for continuity between terminal M1 and audio unit connector C (24P) terminal No. 12: There should be continuity. | ||
| M7* 3 | WHT | Disconnect audio-navigation unit connector B (20P) | Check for continuity between terminal M7 and audio-navigation unit connector B (20P) terminal No. 13: There should be continuity. | An open in the B-CAN wire |
| M1* 3 | TAN | Check for continuity between terminal M1 and audio-navigation unit connector B (20P) terminal No. 3: There should be continuity. |
*1: Without navigation (display audio type)
*2: Without navigation (color audio type)
*3: With navigation
*4: With climate control
*5: Without climate control
*6: With DPMS
*7: With automatic wiper
*8: Without automatic wiper
*9: With BSI
*10: With ventilated seat
*11: With rear seat heater
*12: With auto high-beam
| Cavity | Wire | Test condition | Test: Desired result | Possible cause if desired result is not obtained |
|---|---|---|---|---|
| M7 | WHT | Disconnect gauge control module 32P connector | Check for continuity between terminal M7 and gauge control module 32P connector terminal No. 26: There should be continuity. | An open in the B-CAN wire |
| M1 | TAN | Check for continuity between terminal M1 and gauge control module 32P connector terminal No. 27: There should be continuity. | ||
| M7* 4 | WHT | Disconnect climate control unit connector A (32P) | Check for continuity between terminal M7 and climate control unit connector A (32P) terminal No. 23: There should be continuity. | An open in the B-CAN wire |
| M1* 4 | TAN | Check for continuity between terminal M1 and climate control unit connector A (32P) terminal No. 24: There should be continuity. | ||
| M7* 5 | WHT | Disconnect HVAC control unit connector A (32P) | Check for continuity between terminal M7 and HVAC control unit connector A (32P) terminal No. 23: There should be continuity. | An open in the B-CAN wire |
| M1* 5 | TAN | Check for continuity between terminal M1 and HVAC control unit connector A (32P) terminal No. 24: There should be continuity. | ||
| R10* 6 | WHT | Disconnect power seat control unit connector A (20P) | Check for continuity between terminal R10 and power seat control unit connector A (20P) terminal No. 16: There should be continuity. | An open in the B-CAN wire |
| R11* 6 | TAN | Check for continuity between terminal R11 and power seat control unit connector A (20P) terminal No. 17: There should be continuity. | ||
| M7* 7 | WHT | Disconnect the automatic lighting/rain sensor 5P connector | Check for continuity between terminal M7 and automatic lighting/rain sensor 5P connector terminal No. 4: There should be continuity. | An open in the B-CAN wire |
| M1* 7 | TAN | Check for continuity between terminal M1 and automatic lighting/rain sensor 5P connector terminal No. 3: There should be continuity. |
*1: Without navigation (display audio type)
*2: Without navigation (color audio type)
*3: With navigation
*4: With climate control
*5: Without climate control
*6: With DPMS
*7: With automatic wiper
*8: Without automatic wiper
*9: With BSI
*10: With ventilated seat
*11: With rear seat heater
*12: With auto high-beam
| Cavity | Wire | Test condition | Test: Desired result | Possible cause if desired result is not obtained |
|---|---|---|---|---|
| M7* 8 | WHT | Disconnect the automatic lighting control unit-sensor 5P connector | Check for continuity between terminal M7 and automatic lighting control unit-sensor 5P connector terminal No. 1: There should be continuity. | An open in the B-CAN wire |
| M1* 8 | TAN | Check for continuity between terminal M1 and automatic lighting control unit-sensor 5P connector terminal No. 2: There should be continuity. | ||
| M7 | WHT | Disconnect the parking and back-up sensor control unit 16P connector | Check for continuity between terminal M7 and parking and back-up sensor control unit 16P connector terminal No. 9: There should be continuity. | An open in the B-CAN wire |
| M1 | TAN | Check for continuity between terminal M1 and parking and back-up sensor control unit 16P connector terminal No. 2: There should be continuity. | ||
| R10* 9 | WHT | Disconnect the left side BSI radar unit 6P connector | Check for continuity between terminal R10 and left side BSI radar unit 6P connector terminal No. 3: There should be continuity. | An open in the B-CAN wire |
| R11* 9 | TAN | Check for continuity between terminal R11 and left side BSI radar unit 6P connector terminal No. 5: There should be continuity. | ||
| R10* 9 | WHT | Disconnect the right side BSI radar unit 6P connector | Check for continuity between terminal M10 and right side BSI radar unit 6P connector terminal No. 3: There should be continuity. | An open in the B-CAN wire |
| R11* 9 | TAN | Check for continuity between terminal R11 and right side BSI radar unit 6P connector terminal No. 5: There should be continuity. | ||
| R10* 10 | WHT | Disconnect the ventilated seat control unit 14P connector | Check for continuity between terminal R10 and ventilated seat control unit 14P connector terminal No. 11: There should be continuity. | An open in the B-CAN wire |
| R11* 10 | TAN | Check for continuity between terminal R11 and ventilated seat control unit 14P connector terminal No. 10: There should be continuity. |
*1: Without navigation (display audio type)
*2: Without navigation (color audio type)
*3: With navigation
*4: With climate control
*5: Without climate control
*6: With DPMS
*7: With automatic wiper
*8: Without automatic wiper
*9: With BSI
*10: With ventilated seat
*11: With rear seat heater
*12: With auto high-beam
| Cavity | Wire | Test condition | Test: Desired result | Possible cause if desired result is not obtained |
|---|---|---|---|---|
| R10* 11 | WHT | Disconnect the rear seat heater control unit 14P connector | Check for continuity between terminal R10 and rear seat heater control unit 14P connector terminal No. 11: There should be continuity. | An open in the B-CAN wire |
| R11* 11 | TAN | Check for continuity between terminal R11 and rear seat heater control unit 14P connector terminal No. 10: There should be continuity. | ||
| M7* 12 | WHT | Disconnect the auto high-beam control unit 6P connector | Check for continuity between terminal M7 and auto high-beam control unit 6P connector terminal No. 2: There should be continuity. | An open in the B-CAN wire |
| M1* 12 | TAN | Check for continuity between terminal M1 and auto high-beam control unit 6P connector terminal No. 3: There should be continuity. | ||
| R9 | LT BLU | Under all conditions | Check for continuity between terminal R9 and data link connector (DLC) terminal No. 7: There should be continuity. | An open in the K-LINE wire |
*1: Without navigation (display audio type)
*2: Without navigation (color audio type)
*3: With navigation
*4: With climate control
*5: Without climate control
*6: With DPMS
*7: With automatic wiper
*8: Without automatic wiper
*9: With BSI
*10: With ventilated seat
*11: With rear seat heater
*12: With auto high-beam
5. Reconnect the connectors to the under-dash fuse/relay box, 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, the MICU must be faulty; replace the under-dash fuse/relay box .
| Cavity | Wire | Test condition | Test: Desired result | Possible cause if desired result is not obtained |
|---|---|---|---|---|
| D14 | BLK | In all power modes | Measure the voltage to ground: There should be less than 0.2 V. |
|
| D42 | BLK | In all power modes | Measure the voltage to ground: There should be less than 0.2 V. |
|
| P1 | BLK | In all power modes | Measure the voltage to ground: There should be less than 0.2 V. |
|