1. Review 11 , 12 , 13 , 14 , 15 , 21 , 22 , 23 , 31 , 32 , 41 2. Remove A/C pushbutton control module (N22). Upon completion of test, erase DTC memory from A/C pushbutton control module (see 15 ). Electrical Test Program: Rear A/C only, starts on 23/11 Electrical wiring diagrams: Electrical Troubleshooting Manual, Model 140

Test equipment; See MBUSA Standard Service Equipment Program

Description	Brand, model, etc.
Multimeter 1)	Fluke models 23, 77 III, 83, 85, 87

1) Available through the MBUSA Standard Equipment Program.

Electrical Components in Passenger Compartment Front A/C Figure 1 001 Right connector, A/C pushbutton control module 002 Test cable 003 Multimeter 004 Socket box N22 A/C pushbutton control module
		P83.40-0311-06

Connection diagram for testing the electrical resistance of the following sensors: In-car temperature sensor with aspirator Evaporator temperature sensor Refrigerant temperature sensor Left heater core temperature sensor Right heater core temperature sensor ECT sensor Outside temperature sensor Figure 2
		P83.40-0307-01

Rear A/C Figure 3 N22/3 Rear A/C pushbutton control module 001 Right connector, A/C pushbutton control module 002 Test cable 003 Multimeter 004 Socket box
		P83.50-2018-05