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AUTO A/C DIAGNOSIS TSB Revision AUTOMATIC AIR CONDITIONING 55B-97 . CIRCUIT OPERATION . TROUBLESHOOTING HINTS • Malfunction of the A/C-ECU • Malfunction of the flexible flat cable • Malfunction of the automatic air-conditioning con- trol panel • Malfunction of the defogger relay • Malfunction of the defogger • Damaged harness wires or connectors DIAGNOSIS Required Special Tools: • MB991223: Harness Set • MB991958: Scan Tool (MUT-III Sub Assembly) • MB991824: Vehicle Communication Interface (V.C.I.) • MB991827: MUT-III USB Cable • MB991911: MUT-III Main Harness B (Vehicles without CAN communication system) STEP 1. Check the A/C and outside/inside air selection control motor work normally? A/C-ECU power supply system AC204173 CONNECTORS : D-208, D-209, D-211, BM D-208 D-216 D-217 D-209 D-211(B) AC204179 CONNECTOR : G-10 AJ AC204182 AL E-01(B) E-03(B) CONNECTORS : I-01, I-03 |