TROUBLESHOOTING AND ELECTRICAL SYSTEM:
DIESEL VEHICLES
Test Procedures
12
2117
Figure 12-19
Fan Motor Connector
2118
Figure 12-20
Thermostat Switch Connector
8.
Connect the battery cables, positive (+) cable first.
9.
Leave the Forward/Reverse handle in the NEUTRAL position.
10. Monitor the multimeter while turning the key switch to the ON position. The multimeter should indicate 0 (zero)
VDC with the key in the OFF position and approximately 12 VDC with the key switch in the ON position.
11. If the voltage reading is approximately 12 VDC with the key switch in the OFF position, check the fan relay for
proper wiring and function.
See Test Procedure 9 – Fan Relay on page 12-21.
12. If the voltage reading is not approximately 12 VDC with the key switch in the ON position, check the following:
– Diode 2 for failure in closed condition.
See Test Procedure 14 – Diode 2 on wire 40 on page 12-27.
– Fan relay for proper wiring and function.
See Test Procedure 9 – Fan Relay on page 12-21.
– Both 30-amp fuses (on wires w109 and w125).
See Test Procedure 2 – Fuse on page 12-15.
– Key switch.
See Test Procedure 5 – Key Switch (ON Position) on page 12-18.
– Connections and wire continuity for wires w112, w44, w52, w51, w107, w109, w114, w146, w125, w24, and w48.
2008-2012 All-Wheel Drive Maintenance and Service Manual
Page 12-25
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