Sprinter 2500 L5-2.7L DSL Turbo (2003)
Evaporator Temperature Sensor / Switch: Testing and Inspection
Temperature Control
Before testing the rear A/C temperature control, verify that the front A/C system is operating correctly by performing the ATC Function Test using the
DRBIII(R) scan tool. Use a volt/ohmmeter to test the control. For circuit descriptions and diagrams, refer to the appropriate wiring information. The
wiring information includes wiring diagrams, proper wire and connector repair procedures, details of wire harness routing and retention, connector
pin-out information and location views for the various wire harness connectors, splices and grounds.
1. Disconnect and isolate the battery negative cable.
2. Unplug the wire harness connector from the rear A/C temperature control.
3. Check for continuity between terminal 9 and terminals 3 and 5 of the A/C temperature control. In all instances, there should be continuity.
NOTE: To check the switch's internal circuits, connect the positive lead of the ohmmeter to terminal 9 and the negative lead to terminals 3 and 5.
To check the switches integral light emitting diode, reverse the ohmmeter leads.
4. Check for resistance between terminal 3 and 5 of the A/C temperature control as you move the control to each temperature position. Resistance
should be present and should change for each position.
5. If OK, test and repair the rear A/C temperature control wire harness circuits. If not OK, replace the faulty rear A/C temperature control.