Exterior Lights (MICU) (2016 2017 2018 2019 2020 2021 2022)
NOTE:
- Before testing, troubleshoot the multiplex integrated control unit first, using B-CAN System Diagnosis Test Mode A .
- Before testing, make sure the No. A2-4 (30 A), No. A12 (20 A), No. A20 (10 A), No. A23 (10 A), No. A27 (20 A), and No. A29 (10 A) fuses in the under-hood fuse/relay box are OK.
- Before testing, make sure the No. B5 (7.5 A), No. B34 (7.5 A), No. B38 (10 A), and No. B39 (10 A) fuses in the under-dash fuse/relay box are OK.
1. Press the engine start/stop button to select the OFF mode.
2. Disconnect under-dash fuse/relay box connectors B, C, D, P, T, and W
.NOTE: All connector views are shown from the wire side of the female terminals.
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 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 |
|---|---|---|---|---|
| C19.C12 | TAN.YEL | Connect terminal C19 and ground with a jumper wire | Measure the voltage between terminal C12 and ground:There should be battery voltage. |
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| D29 | TAN | Under all conditions | Connect terminal to ground with a jumper wire:The left headlight (low beam) should come on. |
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| Connect terminal to ground with a jumper wire:The right headlight (low beam) should come on. |
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| C18.C1 | PNK.WHT | Under all conditions | Connect terminals C18 and C1 with a jumper wire:The left headlight (high beam) should come on. |
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| C14.C1 | WHT.WHT | Under all conditions | Connect terminals C14 and C1 with a jumper wire:The right headlight (high beam) should come on. |
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| P11 | PNK | Disconnect keyless access/TPMS control unit connector A (32P) | Check for continuity between terminal P11 and keyless access/TPMS control unit connector A (32P) terminal No. 2:There should be continuity. | An open or high resistance in the wire |
| D20 | BLU | Under all conditions | Connect terminal to ground with a jumper wire:The fog lights should come on. |
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Reconnect the connectors to the under-dash fuse/relay box, 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 |
|---|---|---|---|---|
| D28 | WHT | Under all conditions | Measure the voltage to ground:There should be battery voltage. |
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| C1 | WHT | Under all conditions | Measure the voltage to ground:There should be battery voltage. |
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| W6 | BLK | In all power modes | Measure the voltage to ground:There should be less than 0.2 V. |
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| B32 | BLK | In all power modes | Measure the voltage to ground:There should be less than 0.2 V. |
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| T1.T5 | ORN.BLK | Combination light switch OFF | Measure the voltage between terminals T1 and T5: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 T1 and T5:There should be about 5 V. |
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| T3.T5 | GRY.BLK | Combination light switch (PARKING position) ON | Measure the voltage between terminals T3 and T5:There should be less than 0.2 V. |
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| Combination light switch OFF | Measure the voltage between terminals T3 and T5:There should be about 5 V. |
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| T2.T5 | PNK.BLK | Combination light switch (headlight) ON | Measure the voltage between terminals T2 and T5:There should be less than 0.2 V. |
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| Combination light switch OFF | Measure the voltage between terminals T2 and T5:There should be about 5 V. |
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| T11.T5 | RED.BLK | Combination light switch lever pulled (Passing) | Measure the voltage between terminals T11 and T5:There should be less than 0.2 V. |
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| Combination light switch lever released (OFF) | Measure the voltage between terminals T11 and T5:There should be about 5 V. |
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| T12.T5 | LT BLU.BLK | Combination light switch (Dimmer) in high beam position | Measure the voltage between terminals T12 and T5:There should be less than 0.2 V. |
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| Combination light switch (Dimmer) in low beam position | Measure the voltage between terminals T12 and T5:There should be about 5 V. |
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| T4.T5 | PUR.BLK | Fog light switch ON | Measure the voltage between terminals T4 and T5:There should be less than 0.2 V. |
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| Fog light switch OFF | Measure the voltage between terminals T4 and T5:There should be about 5 V. |
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