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Speedometer Circuit

NOTE: If Lexus hand-held tester is not available, begin testing with step 2).
  1. Connect Lexus hand-held tester to Data Link Connector No. 3 (DLC3). With tester in ACTIVE TEST mode, operate speedometer. If speedometer needle moves as commanded by tester, replace A/C and combination meter integrated ECU. See Figure. If speedometer needle does not move as commanded by tester, check for ABS DTCs. See appropriate ANTI-LOCK - RX300 article in BRAKES. If any DTCs from DTC 31 to DTC 35 are set, repair as necessary. If no DTCs are set, go to next step.
  2. Check for open or short in harness or connector between A/C and combination meter integrated ECU and ABS ECU. Repair as necessary. If circuits are okay, go to next step.
  3. Check speedometer. See SPEEDOMETER  under COMPONENT TESTS. Repair as necessary. If speedometer is okay, replace combination meter circuit plate. See Figure.
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