Reminder Systems (MICU And Gauge Control Module) (2019 2020 2021)
NOTE:
- Before testing, troubleshoot the multiplex integrated control unit first, using B-CAN System Diagnosis Test Mode A - Refer to:
- Before testing, do the Gauges Control Module Self-Diagnostic Function to make sure the beeper and the indicators in the gauge control module work properly and the F-CAN line are OK.
- Before testing, make sure the following fuses No. A26, No. B1-6, No. C29 and No. D4* are OK. Go to: - Fuse to Components Index (With Auto Idle Stop System)
*: With auto idle stop system
MICU
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): (1)
Under-dash fuse relay box connector F (18P) (female terminals): (2)
Under-dash fuse relay box connector M (12P) (female terminals): (3)
Under-dash fuse relay box connector N (20P) (female terminals): (4)
Under-dash fuse relay box connector P (24P) (female terminals): (5)
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. 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, go to step 5.
| Cavity | Wire | Test condition | Test: Desired result | Possible cause if desired result is not obtained |
|---|---|---|---|---|
| M9 | WHT | Under all conditions | Measure the voltage to ground: There should be battery voltage. |
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| F2 | WHT | Vehicle ON mode | Measure the voltage to ground: There should be battery voltage. |
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| D14 | BLK | In all power modes | Measure the voltage to ground: There should be less than 0.2 V. |
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| D42 | BLK | In all power modes | Measure the voltage to ground: There should be less than 0.2 V. |
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| P1 | BLK | In all power modes | Measure the voltage to ground: There should be less than 0.2 V. |
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| D35 | LT BLU | Driver's door open | Measure the voltage to ground: There should be less than 0.2 V. |
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| Driver's door closed | Measure the voltage to ground: There should be less than 0.2 V. |
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| D37 | BLU | Front passenger's door open | Measure the voltage to ground: There should be less than 0.2 V. |
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| Front passenger's door closed | Measure the voltage to ground: There should be about battery voltage. |
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| D34 | PNK | Left rear door open | Measure the voltage to ground: There should be less than 0.2 V. |
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| Left rear door closed | Measure the voltage to ground: There should be about battery voltage. |
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| D28 | GRN | Right rear door open | Measure the voltage to ground: There should be less than 0.2 V. |
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| Right rear door closed | Measure the voltage to ground: There should be about battery voltage. |
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| D39 | PNK | Power tailgate closer unit connector B (6P) disconnected*1 | Check for continuity between terminal D39 and power tailgate closer unit connector B (6P) terminal No. 1: There should be continuity. |
An open or high resistance in the wire |
| Tailgate open*2 | Measure the voltage to ground: There should be less than 0.2 V. |
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| Tailgate closed*2 | Measure the voltage to ground: There should be about battery voltage. |
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| P22 | PNK | Disconnect keyless access/TPMS control unit connector A (32P) | Check for continuity between terminal P22 and keyless access/TPMS control unit connector A (32P) terminal No. 2: There should be continuity. |
An open or high resistance in the wire |
| N18 • N1 |
PNK • BRN |
Combination light switch OFF | Measure the voltage between terminals N18 and N1: There should be less than 0.2 V. |
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| Combination light switch in any position other than OFF | Measure the voltage between terminals N18 and N1: There should be about battery voltage. |
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| N20 • N1 |
WHT • BRN |
Combination light switch (PARKING position) ON | Measure the voltage between terminals N20 and N1: There should be about battery voltage. There should be about battery voltage. |
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| Combination light switch OFF | Measure the voltage between terminals N20 and N1: There should be about battery voltage. |
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| N19 • N1 |
BRN • BRN |
Combination light switch (headlight) ON | Measure the voltage between terminals N19 and N1: There should be less than 0.2 V. |
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| Combination light switch OFF | Measure the voltage between terminals N19 and N1: There should be about battery voltage |
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*1: With power tailgate
*2: Without power tailgate
Gauge Control Module
5. Turn the vehicle to the OFF (LOCK) mode.
6. Disconnect the gauge control module connector A (32P).
Gauge Control Module Connector A (32P) (female terminals)
7. 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 are OK, go to step 8.
8. Reconnect the connector, 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 step 9.
| Cavity | Wire | Test condition | Test: Desired result | Possible cause if desired result is not obtained |
|---|---|---|---|---|
| A1 | WHT | Under all conditions | Measure the voltage to ground: There should be battery voltage. |
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| A17 | GRN | Vehicle ON mode | Measure the voltage to ground: There should be battery voltage. |
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| A4 | BLK | In all power modes | Measure the voltage to ground: There should be less than 0.2 V. |
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| A32 | BRN | In all power modes | Measure the voltage to ground: There should be less than 0.2 V. |
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*1: With auto idle stop system
*2: Without auto idle stop system
9. If multiple failures are found on more than one control unit, replace the Under-Dash Fuse/Relay Box - Removal and Installation (includes the MICU). If input failures are related to a particular control unit, replace the Gauge Control Module - Removal and Installation .