MICU Input Test
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 - Refer to: Body Electrical Troubleshooting - B-CAN System Diagnosis Test Mode B - Control Unit Not Communicating or Body Electrical Troubleshooting - B-CAN System Diagnosis Test Mode A - Initial Communication and DTC Checks or Body Electrical Troubleshooting - B-CAN System Diagnosis Test Mode 1 and Test Mode 2 (without the HDS) .
- Before testing, make sure the No. A26 and No. D4 fuses are 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):
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.
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 resultis 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 the multipurpose camera unit 20P connector | Check for continuity between terminal M7 and multipurpose camera unit 20P connector terminal No. 6:There should be continuity. | An open in the B-CAN wire |
| M1 *1 | TAN | Check for continuity between terminal M1 and multipurpose camera unit 20P connector terminal No. 17:There should be continuity. | ||
| M7 *2 | WHT | Disconnect the 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 the wireless charger 7P connector | Check for continuity between terminal M7 and wireless charger 7P connector terminal No. 3:There should be continuity. | An open in the B-CAN wire |
| M1 *3 | TAN | Check for continuity between terminal M1 and wireless charger 7P connector terminal No. 2:There should be continuity. | ||
| M7 | WHT | Disconnect the gauge control module connector A (32P) | Check for continuity between terminal M7 and gauge control module connector A (32P) terminal No. 30:There should be continuity. | An open in the B-CAN wire |
| M1 | TAN | Check for continuity between terminal M1 and gauge control module connector A (32P) terminal No. 31:There should be continuity. |
*1: With multipurpose camera unit
*2: Color audio type
*3: With wireless charger
*4: With climate control
*5: Without climate control
*6: With DPMS
*7: With automatic wiper
*8: Without automatic wiper
*9: With BSI
*10: With telematics
*11: With power tailgate
*12: With ventilated seat
*13: With front seat heater control unit
| Cavity | Wire | Test condition | Test: Desired result | Possible cause if desired resultis not obtained |
|---|---|---|---|---|
| M7 *4 | WHT | Disconnect the 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 the 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 the 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. | ||
| 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 *9 | 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 *9 | TAN | Check for continuity between terminal M1 and parking and back-up sensor control unit 16P connector terminal No. 2:There should be continuity. |
*1: With multipurpose camera unit
*2: Color audio type
*3: With wireless charger
*4: With climate control
*5: Without climate control
*6: With DPMS
*7: With automatic wiper
*8: Without automatic wiper
*9: With BSI
*10: With telematics
*11: With power tailgate
*12: With ventilated seat
*13: With front seat heater control unit
| Cavity | Wire | Test condition | Test: Desired result | Possible cause if desired resultis not obtained |
|---|---|---|---|---|
| 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 | WHT | Disconnect the ventilated seat control unit 14P connector* 12 or front seat heater control unit 14P connector* 13 | Check for continuity between terminal R10 and ventilated seat control unit 14P connector* 12 or front seat heater control unit 14P connector* 13 terminal No. 11:There should be continuity. | An open in the B-CAN wire |
| R11 | TAN | Check for continuity between terminal R11 and ventilated seat control unit 14P connector* 12 or front seat heater control unit 14P connector* 13 terminal No. 10:There should be continuity. | ||
| R10 | WHT | Disconnect the second row seat heater control unit 14P connector | Check for continuity between terminal R10 and second row seat heater control unit 14P connector terminal No. 11:There should be continuity. | An open in the B-CAN wire |
| R11 | TAN | Check for continuity between terminal R11 and second row seat heater control unit 14P connector terminal No. 10:There should be continuity. | ||
| M7 | WHT | Disconnect the headlight leveling control unit 12P connector | Check for continuity between terminal M7 and headlight leveling control unit 12P connector terminal No. 7:There should be continuity. | An open in the B-CAN wire |
| M1 | TAN | Check for continuity between terminal M1 and headlight leveling control unit 12P connector terminal No. 8:There should be continuity. | ||
| M7 *10 | WHT | Disconnect the telematics control unit 32P connector | Check for continuity between terminal M7 and telematics control unit 32P connector terminal No. 23:There should be continuity. | An open in the B-CAN wire |
| M1 *10 | TAN | Check for continuity between terminal M1 and telematics control unit 32P connector terminal No. 22:There should be continuity. |
*1: With multipurpose camera unit*2: Color audio type*3: With wireless charger*4: With climate control*5: Without climate control*6: With DPMS*7: With automatic wiper*8: Without automatic wiper*9: With BSI*10: With telematics*11: With power tailgate*12: With ventilated seat*13: With front seat heater control unit
| Cavity | Wire | Test condition | Test: Desired result | Possible cause if desired resultis not obtained |
|---|---|---|---|---|
| R10 *11 | WHT | Disconnect the power tailgate control unit connector A (24P) | Check for continuity between terminal R10 and power tailgate control unit connector A (24P) terminal No. 6:There should be continuity. | An open in the B-CAN wire |
| R11 *11 | TAN | Check for continuity between terminal R11 and power tailgate control unit connector A (24P) terminal No. 7: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: With multipurpose camera unit
*2: Color audio type
*3: With wireless charger
*4: With climate control
*5: Without climate control
*6: With DPMS
*7: With automatic wiper
*8: Without automatic wiper
*9: With BSI
*10: With telematics
*11: With power tailgate
*12: With ventilated seat
*13: With front seat heater control unit
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 - Refer to: Under-Dash Fuse/Relay Box Removal and Installation (2019) or Under-Dash Fuse/Relay Box Removal and Installation .
| Cavity | Wire | Test condition | Test: Desired result | Possible cause if desired resultis not obtained |
|---|---|---|---|---|
| E32 | BRN | Vehicle ON mode | Measure the voltage to ground:There should be battery voltage. |
|
| 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. |
|