Exterior Lights (MICU and Relay Control Module) Input Test (2017 2018 2019 2020)
NOTE:
- If you are troubleshooting multiple DTCs, be sure to follow the instructions in B-CAN System Diagnosis Test Mode A - Refer to:
- Before testing, make sure the No. B11 (7.5 A) fuses in the main under-hood fuse box are OK (with auto idle stop system).
- Before testing, make sure the No. C16 (10 A), No. C20 (7.5 A) (Without auto idle stop system), No. C22 (10 A), No. C24 (7.5 A), No. C26 (10 A), and No. C27 (10 A) fuses in the under-hood fuse/relay box are OK.
- Before testing, make sure the No. D11 (7.5 A) fuse in the driver's under-dash fuse/relay box is OK.
Relay Control Module
1. Turn the vehicle to the OFF (LOCK) mode.
2. Disconnect relay control module connectors.
Relay control module connector A (10P) (female terminals):
Relay control module connector B (16P) (female terminals):
Relay control module connector C (8P) (female terminals):
Relay control module connector D (14P) (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 results not obtained |
|---|---|---|---|---|
| B13 | TAN | Under all conditions | Connect terminal to ground with a jumper wire: The left front parking light should come on. |
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| Connect terminal to ground with a jumper wire: The right front parking light should come on. |
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| Connect terminal to ground with a jumper wire: The taillights should come on. |
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| Connect terminal to ground with a jumper wire: The inner taillights and license plate lights should come on. |
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| A5 | PUR | Under all conditions | Connect terminal to ground with a jumper wire: The fog lights should come on. |
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| Cavity | Wire | Test condition | Test: Desired result | Possible cause if desired results not obtained |
|---|---|---|---|---|
| C6C8 | PNKBRN | Under all conditions | Connect terminals C6 and C8 with a jumper wire: The left headlight (high beam) should come on. |
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| D6C1 | TANGRN | Under all conditions | Connect terminals D6 and C1 with a jumper wire: The right headlight (high beam) should come on. |
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5. Reconnect the connectors to the relay control module, 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 6.
| Cavity | Wire | Test condition | Test: Desired result | Possible cause if desired results not obtained |
|---|---|---|---|---|
| B10 | GRN | Under all conditions | Measure the voltage to ground: There should be battery voltage. |
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| B1 | BLK | In all power modes | Measure the voltage to ground: There should be less than 0.2 V. |
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| D12 |
MICU
6. Turn the vehicle to the OFF (LOCK) mode.
7. Disconnect driver's under-dash fuse/relay box connectors.
Driver's under-dash fuse/relay box connector C (2P) (female terminals):
Driver's under-dash fuse/relay box connector F (32P) (female terminals):
Driver's under-dash fuse/relay box connector G (16P) (female terminals):
Driver's under-dash fuse/relay box connector H (13P) (female terminals):
Driver's under-dash fuse/relay box connector P (24P) (female terminals):
Driver's under-dash fuse/relay box connector Q (20P) (female terminals):
8. 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 9.
9. 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 10.
| Cavity | Wire | Test condition | Test: Desired result | Possible cause if desired results not obtained |
|---|---|---|---|---|
| F13 | YEL | Relay control module connector B (16P) disconnected | Check for continuity between terminal F18 and the relay control module connector B (16P) terminal No. 14:There should be continuity. | An open or high resistance in the wire |
| Q4 | PNK | Keyless access/TPMS control unit connector A (32P) disconnected | Check for continuity between terminal Q4 and the keyless access/TPMS control unit connector A (32P) terminal No. 2:There should be continuity. | An open or high resistance in the wire |
10. Reconnect the connectors to the driver's 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 driver's under-dash fuse/relay box - Refer to: Driver's Under-Dash Fuse/Relay Box Removal and Installation .
| Cavity | Wire | Test condition | Test: Desired result | Possible cause if desired results not obtained |
|---|---|---|---|---|
| G16 | GRN | Under all conditions | Measure the voltage to ground: There should be battery voltage. |
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| C2 | GRN | Vehicle ON mode | Measure the voltage to ground: There should be battery voltage. |
An open or high resistance in the wire |
| G6 | BLK | In all power modes | Measure the voltage to ground: There should be less than 0.2 V. |
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| H1 | BLK | In all power modes | Measure the voltage to ground: There should be less than 0.2 V. |
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| P2 | BRN | In all power modes | Measure the voltage to ground: There should be less than 0.2 V. |
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| P17P13 | PNKBLK | Combination light switch OFF | Measure the voltage between terminals P17 and P13: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 P17 and P13:There should be about 5 V. |
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| P19P13 | GRYBLK | Combination light switch (PARKING position) ON | Measure the voltage between terminals P19 and P13:There should be less than 0.2 V. |
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| Combination light switch OFF | Measure the voltage between terminals P19 and P13:There should be about 5 V. |
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| P15P13 | BRNBLK | Combination light switch (headlight) ON | Measure the voltage between terminals P15 and P13:There should be less than 0.2 V. |
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| Combination light switch OFF | Measure the voltage between terminals P15 and P13:There should be about 5 V. |
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| P20P13 | PNKBLK | Combination light switch lever pulled (Passing) | Measure the voltage between terminals P20 and P13:There should be less than 0.2 V. |
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| Combination light switch lever released (OFF) | Measure the voltage between terminals P20 and P13:There should be about 5 V. |
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| P18P13 | PURBLK | Combination light switch (FRONT FOG position) ON | Measure the voltage between terminals P18 and P13:There should be less than 0.2 V. |
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| Combination light switch OFF | Measure the voltage between terminals P18 and P13: There should be about 5 V. |
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| Cavity | Wire | Test condition | Test: Desired result | Possible cause if desired results not obtained |
|---|---|---|---|---|
| P21P13 | LT BLUBLK | Combination light switch (Dimmer) in high beam position | Measure the voltage between terminals P21 and P13: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 P21 and P13:There should be about 5 V. |
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