Pinpoint Test B: Heating And Cooling - Noisy Operation

1. Check the automatic temperature control module for stored DTCs

Are there any stored DTCs?

• Yes: For information on stored DTCs refer to the information in the DIAGNOSTIC TROUBLE CODE INDEX DTC: AUTOMATIC TEMPERATURE CONTROL MODULE (ATCM) -- DISCOVERY SPORT/L550 .
• No: GO to  B2.

Before work is carried out, make the air bag supplemental restraint system safe. For additional information, refer to STANDARD WORKSHOP PRACTICES

The climate controlled seat's (heat and cool) functions will only operate when the vehicle's engine is running

1. There is a known issue which affects a limited number of vehicles where under acceleration of the vehicle the occupant of seat can deform the suspension mat (snake wire) which then presses on the casing of the seat backrest climate assembly, this causes the casing to distort and the noise issue to occur. If contact has occurred there will be a witness mark on the casing. Carry out visual inspection of the seat backrest climate assembly that has been identified as noisy by the customer

Is there a witness mark on the casing?

• Yes: Contact the local in market support for further information
• No: GO to  B3.

1. Operate the heat and cool function of the seat. Listen for a 'WAH WAH' noise (the fan speeds up and slows down repeatedly)

Does the fan speed up and slow down repeatedly?

• Yes: Confirm the latest Strategy and Calibration software is installed, using the manufacturer approved diagnostic system update the automatic temperature control module software if required. If the noise is still evident after software update follow link below GO to  B4.
• No: GO to  B4.

1. Compare the noise level of the suspect climate seat assembly to another climate seat assembly

Is the noise level equal between the two seats?

• Yes: The noise level is standard and comparable to the design intent
• No: Suspect an internal fault with the climate controlled seat assembly. Replace as required