AC–70 AIR CONDITIONING SYSTEM – TROUBLESHOOTING INSPECTION PROCEDURE 1 Check voltage of TSET terminal on A/C amplifier. ON Connect TSET SG BE3840 N08961 P Remove A/C amplifier with connectors still connected. C 1. Turn temperature set dial. 2. Check voltage between terminals TSET and SG of A/C amplifier. OK Set Temperature Voltage 20°C (68°F) 3.88 V 25°C (77°F) 2.50 V 30°C (86°F) 1.12 V NG OK Proceed to next circuit inspection shown on matrix chart (See page AC–26). 2 Check voltage of terminal on A/C control assembly. H12-2 (TSET) H12-11 H12-10 H12-9 (SG) (S5) (GND) N08834 P Remove A/C control assembly with connectors still connected. C Check voltage between following terminal and H12–9 (GND) of A/C control assembly connectors. OK Check Terminals Voltage H12-10 ⊕ – ⊖ H12-9 4.5 – 5.5 V H12-11 ⊕ – ⊖ H12-9 Below 1.0 V H12-2 ⊕ – ⊖ H12-9 See procedure 1. NG OK Repair or replace harness or connectors between A/C amplifier and A/C control assembly. 3 Check harness and connectors for S5 and SG signal. OK NG Repair or replace harness or connectors between A/C amplifier and A/C control assembly. Replace A/C control assembly.