Chevrolet Sonic Repair Manual: Cooling Fan Description and Operation (LUV)
The engine cooling fan system is composed of one cooling fan, a series of 5 relays, the engine control module (ECM), and the associated wiring. The cooling fan assembly includes two resistors. This combination of components enables the ECM to operate the cooling fan at 3 speeds using two fan control circuits.
Low Speed Operation
The ECM applies ground at the FAN 1 control circuit for the coil side of the cooling fan relay. The energized cooling fan relay completes a ground, through the switch side of the relay, for the coils of the cooling fan low speed relay and the cooling fan speed control relay. The speed control relay activates and supplies B+ to the coil side of the cooling fan high speed relay. The high speed relay remains inactive because the ECM is not commanding the FAN 2 control circuit ON. The energized low speed relay switch closes to supply B+ through the internal low speed resistor of the engine cooling fan motor. The result is cooling fan operation at a reduced speed.
Medium Speed Operation
The ECM applies ground at the FAN 2 control circuit for the coil side of the cooling fan high speed, and medium speed relays. The high speed relay remains inactive because the ECM is not commanding the FAN 1 control circuit ON. The energized medium speed relay switch closes to supply B+ through the internal medium speed resistor of the engine cooling fan motor. The result is cooling fan operation at a medium speed.
High Speed Operation
The ECM applies ground at the FAN 1 control circuit for the coil side of the cooling fan relay. The energized cooling fan relay completes a ground, through the switch side of the relay, for the coil of the cooling fan speed control relay. The energized speed control relay switch closes to supply B+ to the coil side of cooling fan high speed relay. Simultaneously, the ECM applies ground at the FAN 2 control circuit for the coil side of the cooling fan high speed relay. The energized high speed relay switch closes to supply B+ directly to the engine cooling fan motor, by-passing the fans internal resistors. The result is cooling fan operation at full speed.
Radiator Fan
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Cooling Fan Description and Operation (LWE, LUW)
System Overview
The engine cooling fan system is composed of one cooling fan, 2 relays, the engine
control module (ECM), and the associated wiring. The cooling fan assembly includes
1̴ ...
Other materials:
Transmission Replacement (With 1.2L or 1.4L Engine)
Removal Procedure
Remove the battery tray. Refer to
Battery Tray Replacement.
Without draining the coolant or removing the hoses,
remove and position aside the radiator surge tank. Refer to
Radiator Surge Tank Replacement.
Remove the transmission range selector lever c ...
System temporarily unavailable
In the Nissan Armada, if the Blind Spot Warning (BSW) system detects that the
radar sensors are obstructed, the system will automatically deactivate and display
the message "Unavailable Side Radar Obstruction" in the vehicle information display.
The Nissan Armada BSW system will remai ...
Speed Limit Assist (a feature of ProPILOT Assist 1.1 and 2.1)
Speed Limit Assist in the Nissan Armada is an advanced functionality integrated
within the ProPILOT Assist 1.1 and 2.1 systems. This feature works in conjunction
with the built-in map locator and Traffic Sign Recognition (TSR) system to help
drivers maintain compliance with posted speed limits ...
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