Seat System: Overview Pontiac Aztek I

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Test Description

The numbers below refer to the step numbers on the diagnostic table.

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1. 2. Lack of communication may be due to a partial malfunction of the class 2 serial data circuit or due to a total malfunction of the class 2 serial data circuit. The specified procedure will determine the particular condition.
2. 4. Determine if any DTCs are present which may be the cause of the condition.
3. 5. The presence of DTCs which begin with "U" indicate some other module is not communicating. The specified procedure will compile all the available information before tests are performed.
4. 6. Determine if an internal memory malfunction exists.
5. 7. Determine if the ignition voltage monitored by the powertrain control module is within acceptable limits.

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The numbers below refer to the step numbers on the diagnostic table.

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1. 3. This step tests the seat adjuster switch for an internal fault.
2. 4. When the seat adjuster switch is disconnected the faulty switch signal circuit will be isolated.

The numbers below refer to the step numbers on the diagnostic table.

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1. 2. Verify that the DTC is current or history by attempting to operate the seat adjuster motor for which the code is set.
2. 3. Tests the adjuster motor supply circuits for proper operation.

The numbers below refer to the step numbers on the diagnostic table.

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1. 2. Verify that the DTC is current or history by monitoring the switch status for which the code is set.
2. 3. Tests the memory select switch for an internal fault.

Symptoms - Seats

Important: The following steps must be completed before using the symptom tables.

1. When diagnosing a memory seat system condition perform the «DIAGNOSTIC SYSTEM CHECK - POWER SEAT SYSTEMS»(ref-180880-S04448526002005073000000) before using the symptom tables in order to verify that all of the following are true: There are no DTCs set. The control module(s) can communicate via the serial data link.
2. Refer to the system description and operation from the following list in order to familiarize yourself with the system functions: «POWER SEATS SYSTEM DESCRIPTION AND OPERATION»(ref-180880-S42132349162005073000000) «HEATED SEATS DESCRIPTION AND OPERATION»(ref-180880-S20453763052005073000000) «MEMORY SEATS DESCRIPTION AND OPERATION»(ref-180880-S38523341272005073000000)

Driver and Passenger Power Seat Operation

The seat adjuster motors are controlled by the seat adjuster switches. Battery positive voltage and ground is supplied to the switch assemblies. All of the switches are closed to ground when in an inactive state. When an adjuster switch is pressed one of the adjuster motor supply circuit is supplied battery positive voltage, and ground is provided through the supply circuit to the inactive switch. The adjuster motors are reversible and the direction of the adjuster motor rotation is determined by which of the supply circuits is closed to battery positive voltage and which remains grounded.

The heated seats system consists of the following components

1. The heated seat switch
2. The driver heated seat relay module
3. The passenger heated seat relay module
4. The driver heated seat thermistor
5. The passenger heated seat thermistor
6. The driver back cushion heater element
7. The driver seat cushion heater element
8. The passenger back cushion heater element
9. The passenger seat cushion heater element
10. The HVAC/DIC/DRL/HEATED SEAT 10A fuse
11. The PWR/HEATED SEAT PSD 30A circuit breaker

The heated seats are controlled by the following components

1. Headed seat switches
2. Heated seat relay modules

Heated Seat Operation

The driver and front passenger seats are heated using electric heater elements with approximately 1 ohm of resistance each and are located in the lower seat cushions and seat backs. Voltage to the heater elements is controlled by the heated seat relay modules using inputs from the heated seat switches and the heated seat thermistors. The heated seat relay modules and thermistors are part of the lower seat cushion heater element assemblies. Ignition voltage is supplied to the heated seat switch assembly and is used to supply a signal voltage to the relay module and to illuminate the heated seat indicator during heated seat operation. Battery voltage is supplied to the relay module through a PTC device located in the seat harness which provides extra circuit protection. During heated seat operation the relay module switches the battery voltage supply circuit to the heater element supply circuit. The seat cushion and back heater elements are wired in series and always operate simultaneously. The seat temperature is regulated by the relay module using an input from the thermistor located in the seat cushion. The thermistor is a temperature sensitive variable resistor and the relay module determines the seat cushion temperature by monitoring the signal voltage supplied to the thermistor. When the desired seat temperature has been reached the relay module will open and close the supply voltage to the heater elements as necessary in order to maintain the seat temperature.

The memory seat system consists of the following components

1. The seat adjuster switch
2. The memory seat module
3. The driver seat adjuster motor assembly
4. The PWR/HEATED SEAT PSD 30A circuit breaker

The memory seat system is controlled by the following components

1. Seat adjuster switch
2. Memory seat module

The seat adjuster motors are controlled by the memory seat module through the adjuster motor supply circuits. Adjuster motor operation occurs when the memory seat module switches one of the adjuster motor supply circuits to battery positive voltage and the other to ground. The adjuster motors are reversible and the direction of the adjuster motor rotation is determined by which of the adjuster motor supply circuits is switched to battery positive voltage and which is grounded.

The seat adjuster switch is supplied with a 12-volt reference circuit by the memory seat module. When a seat adjuster switch is pressed the signal circuit is closed to the 12-volt reference. Closing the switch signal circuit to the reference voltage pulls the signal circuit high indicating to the memory seat module the switch status is active. The memory seat module also uses the serial data circuit for diagnostic purpose and to send and receive messages which affect the memory seat system operation.

The seat adjuster motors are equipped with position sensors. The position sensors are supplied with a 5-volt reference circuit and low reference circuit from the memory seat module. Whenever a memory seat module function is active the memory seat module receives a signal from each position sensor which varies from 0 to 5 volts depending on the seat position. The memory seat module uses the position sensor signal voltages to determine the seat position when storing or recalling seat position settings.

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