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Test No. 16 - Body No. 1 Ecu To A/C Control Assembly Communication Problem: Testing

  1. Disconnect 16-pin M3 connector from multi-display ECU (with navigation system) or 10-pin T5 connector from tilt/telescopic ECU (without navigation system). Disconnect 22-pin A13 connector from A/C control assembly. Disconnect 28-pin E5 connector from ECM (GS300) or 26-pin E7 connector from ECM (GS400).
  2. Check continuity of Blue wire between A/C control assembly connector A13 terminal No. 5 and ECM connector E5 terminal No. 27 (GS300) or ECM connector E7 terminal No. 24 (GS400).
  3. On models without navigation system, check continuity of White wire between A/C control assembly connector A13 terminal No. 16 and tilt/telescopic ECU connector T5 terminal No. 7. See Figure and Figure. On models with navigation system, check continuity of Blue/Red wire between A/C control assembly connector A13 terminal No. 16 and multi-display ECU connector M3 terminal No. 2. See Figure and Figure.
  4. If continuity exists on both wires, replace A/C control assembly. If continuity does not exist or one or both wires, repair wiring as necessary.
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