Land Rover Discovery: Seats - Vehicles With- Climate Controlled Seats - Inspection and verification

PRINCIPLE OF OPERATION

For a detailed description of the seating systems and operation, refer to the relevant description and operation section of the workshop manual. REFER to: Seats (501-10 Seating, Description and Operation).

Inspection and verification

CAUTION:

Diagnosis by substitution from a donor vehicle is NOT acceptable.

Substitution of control modules does not guarantee confirmation of a fault and may also cause additional faults in the vehicle being checked and/or the donor vehicle

NOTES:

• If the control module or a component is suspect and the vehicle remains under manufacturer warranty, refer to the warranty policy and procedures manual, or determine if any prior approval programme is in operation, prior to the installation of a new module/component
• Check and rectify basic faults before beginning diagnostic routines involving pinpoint tests
• If DTCs are recorded and, after performing the pinpoint tests, a fault is not present, an intermittent concern may be the cause.

  Always check for loose connections and corroded terminals

• The DTC index containing an actions list is for guidance only any reference to "check and install new blower unit" should only be carried out following failure confirmation using the pin out diagnostics and/or the over temperature and fluid/air leak diagnostics contained below. The recording of a DTC does NOT signify a permanently failed unit
• The climate system functions in a manner that means any detected error state either intermittent or permanent will shut down the complete seat climate system until the next ignition cycle, this does not mean that both climate units within the one seat have failed.

  This shut down is design intent to protect the system to ensure that the fault detected does not damage the units, it is possible that both units are functioning correctly and that the fault lies elsewhere within the system. The following process can be carried out without removing either the seats or the climate units from the vehicle and should correctly identify any failed units, this should ensure that only failed units are changed under warranty. Any units exhibiting the correct reading as per process below, should NOT be changed under warranty. If all units have a correct reading then re-confirm customer symptom, if customer symptom is still present then carry out further system checks

1. Verify the customer concern
2. Visually inspect for obvious signs of mechanical or electrical damage

Visual Inspection

3. If an obvious cause for an observed or reported concern is found, correct the cause (if possible) before proceeding to the next step
4. If the cause is not visually evident, carry out normal dealer warranty process, perform on-demand self test, check for DTCs and refer to the relevant DTC index
5. Allow 30 mins since the last seat/cooled operation prior to carrying out pin testing detailed below in the section "Connector and Pin Information"
6. Locate climate seat module, (refer to Electrical Information - Electrical Reference Library, contained in TOPIx) for guidance on how to gain access to the connector(s)
7. Locate and disconnect relevant connector prior to pin test
8. Using ohm-meter to probe each heat/cooled unit pins (at rear of connector), reading should achieve no greater than 10 ohms after 1 minute (initial fluctuations in readings may occur using ohm-meter, post 1 minute readings will have stabilized)

CONNECTOR AND PIN INFORMATION

1. If any unit reads greater than 10 ohms, replace only that defective unit
2. If all units read less than 10 ohms but faults are still suspected, do not replace any units. Refer to step 4 below
3. As a final check, when a faulty unit has been identified strip the seat to access unit connector, REFER to: Seats (501-10, Removal & Installation) and re-check ohm reading to confirm greater than 10 ohms prior to removing unit
4. In cases where the above diagnostic routine does NOT identify a failed unit, please refer to the pinpoint tests below. Also check for any live technical service bulletins referring to the seat climate system

SEAT CLIMATE ASSEMBLY - FURTHER DIAGNOSTICS

In the event of suspected climate seat faults use the pinpoint tests detailed below

Connector Checks

First, check the integrity of the three seat climate control module harness connectors:

1. Disconnect each connector
2. Inspect each connector for cracks and breaks, replace as required
3. Check the integrity of connector terminals for bent terminals, backedout or badly crimped wires. Rectify as required
4. Reconnect all connectors and retest. If seat climate functions are still faulty, note any DTCs that have been logged by the automatic temperature control module and refer to the table and pinpoint tests below:

SYMPTOM CHARTS

Heating and Cooling

Seats - Vehicles With- Climate Controlled SeatsSeats - Vehicles With- Climate Controlled Seats - Pinpoint Tests

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