( TL19E00J26346141953FCAT00 )

Reminder Systems (Driver's MICU and Gauge Control Module) Input Test

NOTE: Before testing, do the gauge control module self-diagnostic function to make sure the beeper and the indicators in the gauge control module work properly and the B-CAN and F-CAN lines are OK.
Driver's MICU

1. Turn the ignition switch to LOCK (0).

1. Remove the driver's dashboard undercover, then remove the dashboard lower cover.

1. Disconnect driver's under-dash fuse/relay box connectors D, Q, and R.
   NOTE: All connector views are wire side of female terminals.

1. 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 5 .

1. With the connectors still disconnected, make these input tests at the connectors.
   - 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 result is not obtained
   --- | --- | --- | --- | ---

   Q1

   BLK

   Under all conditions

   Check for continuity to ground: There should be continuity.

   - Poor ground (G501)
   - An open in the wire

   Q2

   BRN

   Under all conditions

   Check for continuity to ground: There should be continuity.

   - Poor ground (G501)
   - An open in the wire

   R2

   BRN

   Under all conditions

   Check for continuity to ground: There should be continuity.

   - Poor ground (G501)
   - An open in the wire

   R5

   BLK

   Under all conditions

   Check for continuity to ground: There should be continuity.

   - Poor ground (G502)
   - An open in the wire

1. Reconnect the connectors to the driver's under-dash fuse/relay box, and make these input tests at the connectors.
   - 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 7 .

   Cavity | Wire | Test condition | Test: Desired result | Possible cause if desired result is not obtained
   --- | --- | --- | --- | ---

   D12

   BRN

   Driver's door open

   Measure the voltage to ground: There should be less than 1 V.

   - Faulty driver's door switch
   - An open in the wire

   Driver's door closed

   Measure the voltage to ground: There should be 5 V or more.

   - Faulty driver's door switch
   - A short to ground in the wire

   Q18

   WHT

   Ignition key inserted into the ignition switch

   Measure the voltage to ground: There should be less than 1 V.

   - Poor ground (G503)
   - Faulty ignition key switch
   - An open in the wire

   Ignition switch in LOCK (0) position and ignition key removed from the ignition switch

   Measure the voltage to ground: There should be 5 V or more.

   - Faulty ignition key switch
   - A short to ground in the wire

   R6·R3

   RED·BLK

   Combination light switch OFF

   Measure the voltage between R6 and R3 terminals: There should be less than 1 V.

   - Faulty combination light switch
   - An open in the wire

   Combination light switch in any other position than OFF

   Measure the voltage between R6 and R3 terminals: There should be 5 V or more.

   - Faulty combination light switch
   - A short to ground in the wire

   R7·R3

   GRY·BLK

   Combination light switch (SMALL position) ON

   Measure the voltage between R7 and R3 terminals: There should be less than 1 V.

   - Faulty combination light switch
   - An open in the wire

   Combination light switch OFF

   Measure the voltage between R7 and R3 terminals: There should be 5 V or more.

   - Faulty combination light switch
   - A short to ground in the wire

   R8·R3

   BRN·BLK

   Combination light switch (Headlight position) ON

   Measure the voltage between R8 and R3 terminals: There should be less than 1 V.

   - Faulty combination light switch
   - An open in the wire

   Combination light switch OFF

   Measure the voltage between R8 and R3 terminals: There should be 5 V or more.

   - Faulty combination light switch
   - A short to ground in the wire