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HOMESERVICE MANUALSLEXUS1998SC 300REPAIR AND DIAGNOSIS (SINGLE PAGE)ELECTRICALGAUGESINSTRUMENT PANELSYSTEM TESTSTEST NO. 13: TWIN TRIP & ODOMETER DISPLAY DOES NOT CHANGE WHILE DRIVING
1998 Lexus SC 300

Test No. 13: Twin Trip & Odometer Display Does Not Change While Driving

1998 Lexus SC 300SECTION Test No. 13: Twin Trip & Odometer Display Does Not Change While Driving
  1. Test drive and check speedometer operation. If speedometer works, go to step  2. If speedometer does not work, disconnect instrument panel connector "A". Raise and support vehicle. Turn ignition on. Check voltage between connector "A" terminal No. 13 (Blue/Red wire) and No. 10 (Blue/Black wire). See Figure. Voltage should vary between zero volts and 5 volts while rotating driveshaft. If voltage is as specified, replace circuit plate and retest. If voltage is not as specified, check ABS ECU. See appropriate ANTI LOCK BRAKES article in BRAKES section. Repair as necessary. If ABS ECU is okay, repair wiring between ABS ECU and instrument panel. See WIRING DIAGRAMS .
  2. Remove instrument panel. Disconnect instrument panel connector "A". Using jumper wires, connect connector "A" terminal No. 2 (Yellow wire), No. 13 (Blue/Red wire) and No. 23 (White/Black wire) to instrument panel terminals. Raise and support vehicle. Turn ignition on. Check voltage between connector "A" terminal No. 13 and 23. Voltage should vary between zero volts and 5 volts while rotating driveshaft. If voltage is not as specified, replace circuit plate and retest. If voltage is as specified, replace trip meter and retest.
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.