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HOMESERVICE MANUALSACURA2018TLX BASE, 2.4L ENGREPAIR AND DIAGNOSISELECTRICALGAUGESGAUGES - TESTING & TROUBLESHOOTINGTESTINGGAUGE CONTROL MODULE INPUT TEST (2015-17)
2018 Acura TLX Base, 2.4L Eng

Gauge Control Module Input Test (2015-17)

2018 Acura TLX Base, 2.4L EngSECTION Gauge Control Module Input Test (2015-17)
NOTE:

1. Turn the vehicle to the OFF (LOCK) mode

2. Disconnect the gauge control module 32P connector.

GHH201402Courtesy of HONDA, U.S.A., INC.

3. 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.

4. With the connector 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 result is not obtained
13 ORN Combination light switch ON Connect to ground with a jumper wire:

The dashlights should come on full bright.
  • Faulty LEDs
  • An open or high resistance in the wire
14 RED Combination light switch ON Connect to ground with a jumper wire:

The dashlights should come on full bright.
  • Faulty bulbs
  • An open or high resistance in the wire
18 BLU Vehicle ON mode, turn signal switch to LEFT Measure the voltage to ground:

There should be battery voltage when the lights are flashing.
  • Faulty MICU
  • Faulty combination light switch
  • An open or high resistance in the wire
17 ORN Vehicle ON mode, turn signal switch to RIGHT Measure the voltage to ground:

There should be battery voltage when the lights are flashing.
  • Faulty MICU
  • Faulty combination light switch
  • An open or high resistance in the wire
12 LT GRN Electric parking brake control unit 30P connector disconnected Check for continuity between terminal 12 and the electric parking brake control unit 30P connector terminal No. 17:

There should be continuity.

 An open or high resistance in the wire

5. Reconnect the connector, and do the following input tests:

Cavity Wire Test condition Test: Desired result Possible cause if desired result is not obtained
1 WHT Under all conditions Measure the voltage to ground:

There should be battery voltage.
  • Blown No. A29 (10 A) fuse in the under-hood fuse/relay box
  • Faulty under-dash fuse/relay box
  • An open or high resistance in the wire
2 BRN Vehicle ON mode Measure the voltage to ground:

There should be battery voltage.
  • Blown No. B5 (7.5 A) fuse in the under-dash fuse/relay box
  • An open or high resistance in the wire
16 BRN In all power modes Measure the voltage to ground:

There should be less than 0.2 V.
  • Poor ground (G306)
  • An open or high resistance in the ground wire
32 BLK In all power modes Measure the voltage to ground:

There should be less than 0.2 V.
  • Poor ground (G305)
  • An open or high resistance in the ground wire
11 GRN Vehicle ON mode, brake fluid is at full level in the reservoir Measure the voltage to ground:

There should be battery voltage.
  • Faulty brake fluid level switch
  • A short to ground in the wire
Vehicle ON mode, brake fluid is at lower level in the reservoir Measure the voltage to ground:

There should be less than 0.2 V.
  • Faulty brake fluid level switch
  • Poor ground (G204) or an open in the ground wire
  • An open or high resistance in the wire
19 PNK Vehicle ON mode, dashlights brightness control ILLUMI (-) button pushed Measure the voltage to ground:

There should be less than 0.2 V.
  • Faulty dashlights brightness control switch
  • Poor ground (G304) or an open in the ground wire
  • An open or high resistance in the wire
Vehicle ON mode, dashlights brightness control ILLUMI (-) button released Measure the voltage to ground:

There should be battery voltage.
  • Faulty dashlights brightness control switch
  • A short to ground in the wire
20 RED Vehicle ON mode, dashlights brightness control ILLUMI (+) button pushed Measure the voltage to ground:

There should be less than 0.2 V.
  • Faulty dashlights brightness control switch
  • Poor ground (G304) or an open in the ground wire
  • An open or high resistance in the wire
Vehicle ON mode, dashlights brightness control ILLUMI (+) button released Measure the voltage to ground:

There should be battery voltage.
  • Faulty dashlights brightness control switch
  • A short to ground in the wire
10 PUR Vehicle ON mode, washer fluid is half or more in the washer reservoir Measure the voltage to ground:

There should be battery voltage.
  • Faulty washer fluid level switch
  • A short to ground in the wire
Vehicle ON mode, washer fluid is empty in the washer reservoir Measure the voltage to ground:

There should be less than 0.2 V.
  • Faulty washer fluid level switch
  • Poor ground (G204) or an open in the ground wire
  • An open or high resistance in the wire
RENDER: 1.0x

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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.