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Diagnostic Routine

  1. Turn ignition on. Check "GAUGE" fuse ("ECU-IG" on Camry, Celica, Cressida, Supra and Tercel, "WIPER" on Pickup and 4Runner, and "TURN GAG" on MR2). If fuse is blown, replace fuse and recheck system. If fuse blows again, check for short circuit between fuse and terminal No. 2 of main switch. Also inspect main switch.
  2. If fuse is okay, check for continuity between terminal No. 3 (terminal No. 20 on MR2 and RWD Corolla) of main switch and body ground. If continuity is not present, check for open between terminal and fuse.
  3. If fuse is blown, replace fuse and recheck. If fuse blows again, check for short between fuse and switch. Check switch operation. If continuity is present, check for battery voltage between terminal No. 2 (terminal No. 16 on MR2 and RWD Corolla) of switch and body ground.
  4. If battery voltage is not present, check for open between terminal and fuse. If voltage is present, check for battery voltage between terminal No. 6 (terminal No. 21 on MR2 and RWD Corolla) of harness side of connector and body ground with main switch turned on.
  5. If battery voltage is not present, inspect main switch. If battery voltage is present, inspect indicator light operation. Connect terminal No. 4 (terminal No. 18 on MR2 and RWD Corolla) to body ground. Indicator light should glow with main switch turned on.
  6. If indicator light does not glow, inspect main (control on MR2 and RWD Corolla) switch. If indicator light does glow, check to see if light glows with main (control) switch turned off.
  7. Disconnect electrical connector from cruise control computer. Check for continuity between terminal No. 13 and body ground. If no continuity is present, check for open between terminal No. 13 and body ground and check for faulty ground connection.
  8. If continuity is present, check for battery voltage between harness connector terminal No. 10 and body ground with main switch turned on. If voltage is not present, check for open between terminal No. 10 of computer and terminal No. 6 (terminal No. 21 on MR2 and Corolla) of main (control) switch.
  9. If voltage is present, connect terminal No. 3 to body ground. Indicator light should glow with main switch turned on. If indicator light does not glow, check for open between terminal No. 3 of computer and terminal No. 4 (terminal No. 18 on MR2 and RWD Corolla) of main (control) switch.
  10. If indicator light did glow, disconnect main (control) switch connector. Check for continuity between terminal No. 3 and body ground. If no continuity is present, check for short between terminal No. 3 of computer and terminal No. 4 (terminal No. 18 on MR2 and RWD Corolla) of main (control) switch. If no continuity is present, replace computer.
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