How to Troubleshoot the Gauges
The gauge control module (TACH) has a self-diagnostic function shown, and also has a customize reset function.
  • The beeper drive circuit check.
  • The indicator drive circuit check.
  • The switch input test.
  • The LCD segments check.
  • The gauges drive circuit check (Tachometer, Fuel gauge, Coolant temperature gauge).
  • The communication line check (of the body-controller area network (B-CAN) communication line and the fast-controller area network (F-CAN) communication line between the gauges).
  • The UART line check between the gauge control module (TACH) and the gauge control module (SPEEDO).
NOTE: Indicators are also controlled via the communication line.
Entering the self-diagnostic function
Before doing the self-diagnostic function, check the No. 10 (7.5 A) fuse in the under-dash fuse/relay box and No. 16 (15 A) fuse in the under-hood fuse/relay box.
  1. Push and hold the SEL/RESET switch.
  1. Turn the headlights ON.
  1. Turn the ignition switch to ON (II).
  1. Within 5 sec., turn the headlights OFF, then ON and OFF again.
  1. Within 5 sec., release the SEL/RESET switch, and then push and release the button three times repeatedly.
NOTE:
  • While in the self-diagnostic mode, the dash lights brightness controller operates normally.
  • While in the self-diagnostic mode, the SEL/RESET switch is used to start the Beeper Drive Circuit Test and the Gauge Drive Circuit Check.
  • If the vehicle speed exceeds 2 km/h (1.2 mph) or the ignition switch is turned to LOCK (0), the self-diagnostic mode ends.