Memory Seat Feature Malfunction
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Memory Seat Feature Malfunction
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Diagnostic Fault Information
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Circuit
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Short to Ground
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Open/High Resistance
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Short to Voltage
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Signal Performance
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Memory Set Switch Signal
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1
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1
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-
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-
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Memory Switch Signal
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1
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1
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1
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-
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Driver Seat Memory Switch Low Reference
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-
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1
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-
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-
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1. Memory seat feature inoperative
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Circuit/System Description
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Low reference is supplied to the driver seat memory switch from the seat memory control module. When a memory switch is pressed, the signal circuit from the seat memory control module is pulled low through the switch contacts and series of resistors indicating the memory recall request. In response to this signal, the seat memory control module commands the appropriate seat motors to move to the pre-recorded seat positions stored in memory.
The seat memory control module must be awake when measuring voltage from either one of the memory seat switch signal circuits. Voltage readings of 0.0 V or 5 V are possible if the module is not fully awake and result in miss-diagnosing the circuit.
Schematic Reference
Driver Seat Schematics
Connector End View Reference
Component Connector End Views
Description and Operation
Memory Seats Description and Operation
Electrical Information Reference
Scan Tool Reference
Control Module References
for scan tool information
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Circuit/System Verification
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1.
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Verify that all manual driver power seat functions operate when being controlled by the power seat adjuster switches.
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3.
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Verify that the memory recall personalization option is ON. Refer to the owners manual.
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1.
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Ignition OFF, disconnect the harness connector at the S47D driver seat memory switch.
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2.
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Test for less than 15 Ω between the low reference circuit terminal 1 and ground.
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3.
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If greater than the specified range, test the low reference circuit for an open/high resistance. If the circuit tests normal, replace the K40 seat memory control module.
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4.
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Ignition ON, press a power seat switch in order to wake up the K40 seat memory control module. Test for greater than 9 V between the signal circuit terminal 6 and ground.
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5.
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If less than the specified range, test the signal circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the K40 seat memory control module.
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6.
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Test for greater than 9 V between the signal circuit terminal 5 and ground.
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7.
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If less than the specified range, test the signal circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the K40 seat memory control module.
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8.
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If all circuits test normal, test or replace the S47D driver seat memory switch.
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Driver Seat Memory Switch
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1.
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Disconnect the harness connector at the S47D driver seat memory switch.
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2.
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Test for infinite resistance between the low reference terminal 1 and the signal terminals listed below with the switch in the open position.
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3.
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If not the specified value, replace the S47D driver seat memory switch.
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4.
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Test the resistance between terminal 1 and terminal 6 while pressing the memory 1 and memory 2 buttons. Compare the resistance readings to the values in the Memory Switch Values table below.
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5.
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If the resistance is not within the specified range, replace the S47D driver seat memory switch.
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6.
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Test for less than 1 Ω between terminal 1 and terminal 5 while pressing the memory set switch.
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7.
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If greater than the specified range, replace the S47D driver seat memory switch.
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Memory Switch Values
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Switch Position
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Resistance
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Memory 1
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570 - 698 Ω
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Memory 2
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1800 - 2209 Ω
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Perform the
Diagnostic Repair Verification
after completing the diagnostic procedure.
