MICU Input Test (2016 2017 2018)
NOTE:
- If you are troubleshooting multiple DTCs, be sure to follow the instructions in B-CAN System Diagnosis Test Mode A .
- Before testing, check for DTCs. If any DTCs are indicated, troubleshoot those DTCs first.
- Before testing, make sure the No. B21 (10 A) fuse in the under-hood fuse/relay box is OK.
1. Turn the vehicle to the OFF (LOCK) mode.
2. Disconnect under-dash fuse/relay box connectors D, G, H, N, and Q.
NOTE:
All connector views are shown from the wire side of the 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 resultis not obtained |
|---|---|---|---|---|
| D1 | PNK | Disconnect the gauge control module 32P connector | Check for continuity between terminal D1 and gauge control module 32P connector terminal No. 23:There should be continuity. | An open in the B-CAN wire |
| D2 | BLU | Check for continuity between terminal D2 and gauge control module 32P connector terminal No. 24:There should be continuity. | ||
| D1 | PNK | Disconnect the climate control unit connector A (32P) | Check for continuity between terminal D1 and climate control unit connector A (32P) terminal No. 19:There should be continuity. | An open in the B-CAN wire |
| D2 | BLU | Check for continuity between terminal D2 and climate control unit connector A (32P) terminal No. 21:There should be continuity. | ||
| D1 | PNK | Disconnect the automatic lighting control unit-sensor 7P connector | Check for continuity between terminal D1 and automatic lighting control unit-sensor 7P connector terminal No. 6:There should be continuity. | An open in the B-CAN wire |
| D2 | BLU | Check for continuity between terminal D2 and automatic lighting control unit-sensor 7P connector terminal No. 7:There should be continuity. | ||
| H12* 1 | PNK | Disconnect the immobilizer-keyless control unit 7P connector | Check for continuity between terminal H12 and immobilizer-keyless control unit 7P connector terminal No. 4:There should be continuity. | An open in the B-CAN wire |
| H11* 1 | BLU | Check for continuity between terminal H11 and immobilizer-keyless control unit 7P connector terminal No. 5:There should be continuity. |
*1: Without keyless access system*2: With keyless access system*3: Display audio type*4: Color audio type*5: With navigation
| Cavity | Wire | Test condition | Test: Desired result | Possible cause if desired resultis not obtained |
|---|---|---|---|---|
| H12* 2 | PNK | Disconnect keyless access control unit connector C (20P) | Check for continuity between terminal H12 and keyless access control unit connector C (20P) terminal No. 1:There should be continuity. | An open in the B-CAN wire |
| H11* 2 | BLU | Check for continuity between terminal H11 and keyless access control unit connector C (20P) terminal No. 11:There should be continuity. | ||
| D1* 3 | PNK | Disconnect audio unit connector B (20P) | Check for continuity between terminal D1 and audio unit connector B (20P) terminal No. 13:There should be continuity. | An open in the B-CAN wire |
| D2* 3 | BLU | Check for continuity between terminal D2 and audio unit connector B (20P) terminal No. 3:There should be continuity. | ||
| D1* 4 | PNK | Disconnect audio unit connector C (24P) | Check for continuity between terminal D1 and audio unit connector C (24P) terminal No. 24:There should be continuity. | An open in the B-CAN wire |
| D2* 4 | BLU | Check for continuity between terminal D2 and audio unit connector C (24P) terminal No. 12:There should be continuity. | ||
| D1* 5 | PNK | Disconnect audio-navigation unit connector B (20P) | Check for continuity between terminal D1 and audio-navigation unit connector B (20P) terminal No. 13:There should be continuity. | An open in the B-CAN wire |
| D2* 5 | BLU | Check for continuity between terminal D2 and audio-navigation unit connector B (20P) terminal No. 3:There should be continuity. | ||
| D13 | LT BLU | Under all conditions | Check for continuity between terminal D13 and data link connector (DLC) terminal No. 7:There should be continuity. | An open in the K LINE wire |
*1: Without keyless access system
*2: With keyless access system
*3: Display audio type
*4: Color audio type
*5: With navigation
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 resultis not obtained |
|---|---|---|---|---|
| Q15 | RED | Under all conditions | Measure the voltage to ground:There should be battery voltage. |
|
| Cavity | Wire | Test condition | Test: Desired result | Possible cause if desired resultis not obtained |
|---|---|---|---|---|
| D23 | BLK | In all power modes | Measure the voltage to ground:There should be less than 0.2 V. |
|
| H1 | BLK | In all power modes | Measure the voltage to ground:There should be less than 0.2 V. |
|
| N6 | BLK | In all power modes | Measure the voltage to ground:There should be less than 0.2 V. |
|
| N38 | BLK | In all power modes | Measure the voltage to ground:There should be less than 0.2 V. |
|