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3.3 Air Conditioning (A/C)    >   15 Diagnosis - Diagnostic Trouble Code (DTC) Memory

Preparations for DTC Readout 1. Ignition: ON 2. Press until appears in display window. 3. Within 20 seconds press and simultaneously for more than 2 seconds. 4. The LED in blinks at 1 Hz and the display shows . 5. Press repeatedly until all DTC's are displayed. Record each DTC as it is displayed. 6. Each malfunction (short circuit, open circuit, etc.) has a specific DTC code. The continuous faults are displayed first (e.g. ). If no continuous faults are stored, the display shows . Press again and the intermittent faults will be displayed. Intermittent DTC's are recognizable by the o - symbol e.g. . If no intermittent faults are stored, the display shows . 7. Press again and the display shows (delete). To erase: Press and simultaneously for more than 5 seconds and the display shows "-- -". To cancel erase: By pressing the continuous faults will appear again. 8. Bring temperature preselection to base setting (press and simultaneously to restore to 72 °F). 9. Ignition: OFF , end of test program. Diagnostic trouble code (DTC) N22 Possible cause Test step/Remedy 1) No malfunction in system - A/C pushbutton control module (N22) N22 In-car temperature sensor with aspirator blower (B10/4), short circuit 2) 23 4.0 In-car temperature sensor with aspirator blower (B10/4), short circuit 3) 23 4.0 In-car temperature sensor with aspirator blower (B10/4), short or open circuit 2) 23 4.0 In-car temperature sensor with aspirator blower (B10/4), short or open circuit 3) 23 4.0 Outside temperature sensor (B10/5), short circuit 2) 23 5.0 Outside temperature sensor (B10/5), short circuit 3) 23 5.0 Outside temperature sensor (B10/5), short or open circuit 2) 23 5.0 Outside temperature sensor (B10/5), short or open circuit 3) 23 5.0 Heater core temperature sensor (B10/1), short circuit 2) 23 7.0 Heater core temperature sensor (B10/1), short circuit 3) 23 7.0 Heater core temperature sensor (B10/1), short or open circuit 2) 23 7.0 Heater core temperature sensor (B10/1), short or open circuit 3) 23 7.0 Evaporator temperature sensor (B10/6), short circuit 2) 23 6.0 Evaporator temperature sensor (B10/6), short circuit 3) 23 6.0 Evaporator temperature sensor (B10/6), short or open circuit 2) 23 6.0 Evaporator temperature sensor (B10/6), short or open circuit 3) 23 6.0 Engine coolant temperature sensor (B10/8), short circuit 2) 23 8.0 Engine coolant temperature sensor (B10/8), short circuit 3) 23 8.0 Engine coolant temperature sensor (B10/8), short or open circuit 2) 23 8.0 Engine coolant temperature sensor (B10/8), short or open circuit 3) 23 8.0 Refrigerant pressure sensor (B12), short circuit 2) 23 9.0 Refrigerant pressure sensor (B12), short circuit 3) 23 9.0 Refrigerant pressure sensor (B12), short or open circuit 2) 23 9.0 Refrigerant pressure sensor (B12), short or open circuit 3) 23 9.0 A/C compressor rpm sensor (A9l1) 23 17.0 Poly-V-belt slip recognition 23 17.0 Auxiliary coolant pump (M13), short circuit 2) 23 14.0 Auxiliary coolant pump (M13), short circuit 3) 23 14.0 Auxiliary coolant pump (M13), short or open circuit 2) 23 14.0 Auxiliary coolant pump (M13), short or open circuit 3) 23 14.0 Duovalve (Y21), short circuit 2) 23 15.0 Duovalve (Y21), short circuit 3) 23 15.0 Duovalve (Y21), short or open circuit 2) 23 15.0 Duovalve (Y21), short or open circuit 3) 23 15.0 A/C compressor electromagnetic clutch (A9k1) 2) 23 17.0 A/C compressor electromagnetic clutch (A9k1) 3) 23 17.0 A/C compressor electromagnetic clutch (A9k1), short or open circuit 2) 23 17.0 A/C compressor electromagnetic clutch (A9k1), short or open circuit 3) 23 17.0 Activation of auxiliary fan stage 1, short circuit 2) 23 11.0 Activation of auxiliary fan stage 1, short circuit 3) 23 11.0 Activation of auxiliary fan stage 1, short or open circuit 2) 23 11.0 Activation of auxiliary fan stage 1, short or open circuit 3) 23 11.0 Activation of auxiliary fan stage 2, short circuit 2) 23 12.0 Activation of auxiliary fan stage 2, short circuit 3) 23 12.0 Activation of auxiliary fan stage 2, short or open circuit 2) 23 12.0 Activation of auxiliary fan stage 2, short or open circuit 3) 23 12.0 Closed throttle speed increase, short or open circuit 2) 23 13.0 Closed throttle speed increase, short or open circuit 3) 23 13.0 Closed throttle speed increase, short circuit 2) 23 13.0 Closed throttle speed increase, short circuit 3) 23 13.0 Switchover valve block (8 connections, Y11/3), diverter flap 2) 23 19.0 Switchover valve block (Y11/3), diverter flap 3) 23 19.0 Switchover valve block (Y11/3), diverter flap, short or open circuit 2) 23 19.0 Switchover valve block (Y11/3), diverter flap, short or open circuit 3) 23 19.0 Switchover valve block (Y11/3), tempering flap 2) 23 20.0 Switchover valve block (Y11/3), tempering flap 3) 23 20.0 Switchover valve block (Y11/3), tempering flap, short or open circuit 2) 23 20.0 Switchover valve block (Y11/3), tempering flap, short or open circuit 3) 23 20.0 Switchover valve block (Y11/3), fresh/recirculating air flap, long stroke (80%) 2) 23 21.0 Switchover valve block (Y11/3), fresh/recirculating air flap, long stroke (80%) 3) 23 21.0 Switchover valve block Y11/3), fresh/recirculating air flap, long stroke (80%) short or open circuit 2) 23 21.0 Switchover valve block Y11/3), fresh/recirculating air flap, long stroke (80%) short or open circuit 3) 23 21.0 Switchover valve block (Y11/3), fresh/recirculating air flap, short stroke (20%) 2) 23 22.0 Switchover valve block (Y11/3), fresh/recirculating air flap, short stroke (20%) 3) 23 22.0 Switchover valve block (Y11/3), fresh/recirculating air flap, short stroke (20%) short or open circuit 2) 23 22.0 Switchover valve block (Y11/3), fresh/recirculating air flap, short stroke (20%) short or open circuit 3) 23 22.0 Switchover valve block (Y11/3), defroster flap, long stroke (80%) 2) 23 25.0 Switchover valve block (Y11/3), defroster flap, long stroke (80%) 3) 23 25.0 Switchover valve block (Y11/3), defroster flap, long stroke (80%) short or open circuit 2) 23 25.0 Switchover valve block (Y11/3), defroster flap, long stroke (80%) short or open circuit 3) 23 25.0 Switchover valve block (Y11/3), defroster flap, short stroke (20%) 2) 23 26.0 Switchover valve block (Y11/3), defroster flap, short stroke (20%) 3) 23 26.0 Switchover valve block (Y11/3), defroster flap, short stroke (20%) short or open circuit 2) 23 26.0 Switchover valve block (Y11/3), defroster flap, short stroke (20%) short or open circuit 3) 23 26.0 Switchover valve block (Y11/3), footwell flap, long stroke (80%) 2) 23 23.0 Switchover valve block (Y11/3), footwell flap, long stroke (80%) 3) 23 23.0 Switchover valve block (Y11/3), footwell flap, long stroke (80%) short or open circuit 2) 23 23.0 Switchover valve block (Y11/3), footwell flap, long stroke (80%) short or open circuit 3) 23 23.0 Switchover valve block (Y11/3), footwell flap, short stroke (20%) 2) 23 24.0 Switchover valve block (Y11/3), footwell flap, short stroke (20%) 3) 23 24.0 Switchover valve block (Y11/3), footwell flap, short stroke (20%) short or open circuit 2) 23 24.0 Switchover valve block (Y11/3), footwell flap, short stroke (20%) short or open circuit 3) 23 24.0 1) Observe Preparation for Test. 2) Continuous faults. 3) Intermittent faults.