Compressor Control: Description

WARNING: This page is about a different car, the 2018 Nissan Sentra. However, it is still accessible from the selected car via links, so may be relevant.

In order for the IPDM E/R to complete a compressor ON request, the following conditions must be met:

The BCM detects a Fan ON signal from the A/C auto amp. The A/C auto amp. grounds the fan ON signal monitored by the BCM when the blower speed dial is in any of the fan speed positions.
The BCM detects an A/C ON signal from the A/C auto amp. The A/C auto amp. grounds the A/C ON signal monitored by the BCM when:
- The A/C switch is pressed. The A/C switch LED illuminates and the A/C auto amp. grounds the A/C ON signal monitored by the BCM. Any mode control button except D/F may be selected.
- The A/C switch is OFF, and the MAX A/C button is pressed. The A/C switch LED will automatically illuminate and the A/C auto amp. grounds the A/C ON signal monitored by the BCM.
- The A/C switch is OFF, and the mode button for either D/F or DEF is selected. The A/C auto amp. grounds the A/C ON signal monitored by the BCM, but it does not illuminate the A/C switch LED

NOTE: If the compressor was engaged by pressing the D/F or DEF mode buttons, and the time spent in either mode exceeds 1 minute, then the compressor stays requested, even when modes other than D/F or DEF are selected, until either:

The ignition switch is turned OFF.
The blower speed dial is turned completely counterclockwise to the OFF position.
The A/C switch is manually turned OFF.

In other words, the compressor ON request cannot be turned off in D/F or DEF modes.