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Seat System - Seats: Overview Ford Flex I

Seats 26 illustrations ~7576 words

Normal Operation

The driver seat control switch is supplied battery voltage and ground. When pressed, the seat control switch supplies voltage and ground to a power seat track motor or power recliner motor to move the seat or backrest to the desired position. There are 3 power seat track motors that combine to move the seat cushion horizontally (forward/rearward) and vertically (front up/down and rear up/down). There is an additional motor in the power recliner mechanism to move the seat backrest forward and rearward. If a new motor needs to be installed, it is necessary to install an entire power seat track or power recliner mechanism.

This pinpoint test is intended to diagnose the following

  1. Fuse
  2. Wiring, terminals or connectors
  3. Seat control switch

The driver seat control switch is supplied battery voltage and ground. When pressed, the seat control switch supplies that voltage and ground to a power seat track motor to move the seat to the desired position. There are 3 power seat track motors that combine to move the seat cushion horizontally (forward/rearward) and vertically (front up/down and rear up/down). If a new motor needs to be installed, it is necessary to install an entire power seat track.

This pinpoint test is intended to diagnose the following

  1. Fuse
  2. Wiring, terminals or connectors
  3. Seat control switch

The passenger seat control switch is supplied battery voltage and ground. When pressed, the seat control switch supplies voltage and ground to the appropriate seat track motor to move the seat to the desired position. There are 3 seat track motors that combine to move the seat cushion horizontally (forward/rearward) and vertically (front up/down and rear up/down).

This pinpoint test is intended to diagnose the following

  1. Fuse
  2. Wiring, terminals or connectors
  3. Seat control switch

The driver seat control switch is supplied battery voltage and ground. When pressed, the seat control switch supplies voltage and ground to the appropriate power seat track motor or power recliner motor to move the seat or backrest. There are 3 power seat track motors that combine to move the seat cushion horizontally (forward/rearward) and vertically (front up/down and rear up/down). There is an additional motor in the power recliner mechanism to pivot the seat backrest forward and rearward.

This pinpoint test is intended to diagnose the following

  1. Wiring, terminals or connectors
  2. Seat control switch
  3. Power seat motor (seat track)
  4. Power recliner mechanism

The driver seat control switch is supplied battery voltage and ground. When pressed, the seat control switch supplies that voltage and ground to a power seat track motor to move the seat. When pressed in the opposite direction, the seat control switch reverses the polarity to that same power seat track motor, which moves the seat in the opposite direction. There are 3 power seat track motors that combine to move the seat cushion horizontally (forward/rearward) and vertically (front up/down and rear up/down). If a new motor needs to be installed, it is necessary to install an entire power seat track.

This pinpoint test is intended to diagnose the following

  1. Wiring, terminals or connectors
  2. Seat control switch
  3. Power seat motor (seat track)

The passenger seat control switch is supplied battery voltage and ground. When pressed, the seat control switch supplies that voltage and ground to a power seat track motor to move the seat. When pressed in the opposite direction, the seat control switch reverses the polarity to that same power seat track motor, which moves the seat in the opposite direction. There is a power seat track motor that moves the seat horizontally (forward/reverse) and a motor in the power recliner mechanism that moves the seat backrest forward or rearward.

This pinpoint test is intended to diagnose the following

  1. Wiring, terminals or connectors
  2. Seat control switch
  3. Power seat motor (seat track)

The driver seat control switch is supplied battery voltage and ground. When pressed, the seat control switch supplies voltage and ground to the applicable Driver Seat Module (DSM) inputs. The DSM then supplies voltage and ground to the appropriate power seat track or recline motor based on the inputs received from the seat control switch. There are 3 power seat track motors that combine to move the seat horizontally (forward/backward) and vertically (front up/down and rear up/down). The recliner mechanism uses a single motor to pivot the seat backrest forward and backward.

Battery voltage is also supplied to the DSM on circuit CBX05 (VT/RD) and CBX03 (BU/RD). Ground is supplied on circuits GD906 (BK/GY) and GD905 (BK/GN).

Each motor in the memory seat track and recliner contain a Hall-effect position sensor. The DSM supplies a shared signal feed circuit to each sensor. Each position sensor sends a signal pulse back to the DSM to monitor the position of the power seat and seat backrest. The DSM uses this information to return the seat to a stored pre-programmed position when pressing the memory SET switch or a Remote Keyless Entry (RKE). For information on programming memory positions or recalling a stored memory position, refer to MEMORY POSITION PROGRAMMING .

The following pinpoint test diagnoses a memory seat that does not operate in one or more directions when using the seat control switch. If the memory seat moves in all directions using the seat control switch, but does not operate using the memory SET switch, GO to PINPOINT TEST K .

DTC DescriptionFault Trigger Conditions
B1342 - ECU is FaultedIf a programming error is detected, the DTC is set.
B1663 - Seat Driver Front Up/Down Motor Stalled B1664 - Seat Driver Rear Up/Down Motor Stalled B1665 - Seat Driver Forward/Backward Motor StalledDuring self test, the Driver Seat Module (DSM) attempts to operate the appropriate seat track motor and uses the motor's position sensor to monitor movement. If no motor movement is sensed, the DTC is set. The DSM will retry motor operation on the next activation of the seat control switch. If no movement continues to be monitored after 250 milliseconds, the DSM disables the output.
B1666 - Seat Driver Recline Motor StalledDuring self test, the DSM attempts to operate the recliner motor and uses the recliner motor position sensor to monitor movement. If no motor movement is sensed, the DTC is set. The DSM will retry motor operation on the next activation of the seat control switch. If no motor movement is still monitored after 250 milliseconds, the DSM disables the output.
B1703 - Seat Driver Recline Forward Switch Circuit Short to Battery B1707 - Seat Driver Recline Rearward Switch Circuit Short to BatteryIf voltage is sensed on the switch input circuit during the self test, the DTC is set. If voltage is sensed on the input circuit for greater than 2 minutes the DTC is set as continuous. With the DTC set, any input signal on the circuit is ignored.
B1711 - Seat Driver Front Up Switch Circuit Short to Battery B1715 - Seat Driver Front Down Switch Circuit Short to BatteryIf voltage is sensed on the switch input circuit during the self test, the DTC is set. If voltage is sensed on the input circuit for greater than 2 minutes the DTC is set as continuous. With the DTC set, any input signal on the circuit is ignored.
B1719 - Seat Driver Forward Switch Circuit Short to Battery B1723 - Seat Driver Rearward Switch Circuit Short to BatteryIf voltage is sensed on the switch input circuit during the self test, the DTC is set. If voltage is sensed on the input circuit for greater than 2 minutes the DTC is set as continuous. With the DTC set, any input signal on the circuit is ignored.
B1727 - Seat Driver Rear Up Switch Circuit Short to Battery B1731 - Seat Driver Rear Down Switch Circuit Short to BatteryIf voltage is sensed on the switch input circuit during the self test, the DTC is set. If voltage is sensed on the input circuit for greater than 2 minutes the DTC is set as continuous. With the DTC set, any input signal on the circuit is ignored.

DTC DESCRIPTION AND FAULT TRIGGER CONDITIONS

This pinpoint test is intended to diagnose the following

  1. Fuse
  2. Wiring, terminals or connectors
  3. Seat control switch
  4. Missing status information (Controller Area Network (CAN) communication bus messages): ignition switch status gear selector position
  5. Seat track motor (seat track)
  6. Power recliner motor
  7. DSM

The driver seat control switch is supplied battery voltage and ground. When pressed, the seat control switch supplies voltage and ground to the applicable Driver Seat Module (DSM) inputs. The DSM then supplies voltage and ground to the appropriate power seat track motor or power recline motor based on the inputs received from the seat control switch. When pressed in the opposite direction, the seat control switch reverses the polarity to the DSM inputs, and the DSM likewise reverses polarity of the appropriate power seat track motor or power recliner motor circuits, causing the seat or backrest to move in the opposite direction. There are 3 power seat track motors that combine to move the seat horizontally (forward/backward) and vertically (front up/down and rear up/down). The seat backrest power recliner mechanism uses a single motor to move the seat backrest forward and backward.

Battery voltage is also supplied to the DSM on circuits CBX05 (VT/RD) and CBX03 (BU/RD). Ground is supplied to the DSM on circuits GD906 (BK/GY) and GD905 (BK/GN).

Each motor in the memory power seat track and power recliner mechanism contains a Hall-effect position sensor. The DSM supplies a shared signal feed circuit to each position sensor. Each position sensor sends a signal pulse back to the DSM to monitor the position of the power seat and seat backrest. The DSM uses this information to return the seat to a stored pre-programmed position when pressing the memory SET switch or a Remote Keyless Entry (RKE). For information on programming memory positions or recalling a stored memory position, refer to MEMORY POSITION PROGRAMMING .

The following pinpoint test diagnoses a memory seat that does not operate correctly using the memory SET switch. If the memory seat does not move in all directions using the seat control switch, GO to PINPOINT TEST J .

DTC DescriptionFault Trigger Conditions
B1342 - ECU is FaultedIf a programming error is detected, the DTC is set.
B1534 - Memory 1 Switch Circuit Short to Ground B1538 - Memory 2 Switch Circuit Short to GroundIf any activity is sensed on the switch input circuit during self-test, the DTC is set. If activity is sensed on the input circuit for greater than 2 minutes, the DTC is set as continuous. With the DTC set, any input signal on the circuit is ignored.
B1663 - Seat Driver Front Up/Down Motor Stalled B1664 - Seat Driver Rear Up/Down Motor Stalled B1665 - Seat Driver Forward/Backward Motor StalledDuring self-test the DSM attempts to operate the seat track motors and uses the motor's position sensor to monitor movement. If no motor movement is sensed, a DTC is set. The DSM will retry motor operation on the next activation of the seat control switch. If no movement continues to be monitored after 250 milliseconds, the DSM disables the output.
B1666 - Seat Driver Recline Motor StalledDuring self-test the DSM attempts to operate the recliner motor and uses the recliner motor position sensor to monitor movement. If no motor movement is sensed, the DTC is set. The DSM will retry motor operation on the next activation of the seat control switch. If no motor movement is still monitored after 250 milliseconds, the DSM disables the output.
B1952 - Seat Rear Up/Down Position Feedback Circuit Short to Battery B1956 - Seat Front Up/Down Position Feedback Circuit Short to Battery B1960 - Seat Recline Forward/Backward Position Feedback Circuit Short to Battery B1964 - Seat Horizontal Forward/Rearward Position Feedback Circuit Short to BatteryIf a short to voltage condition is present on the affected motor's position sensor (Hall effect) feedback circuit, the DTC is set. After a DTC is set, a memory recall is not possible but the seat control switch can operate the associated motor in one second increments.
B1953 - Seat Rear Up/Down Position Feedback Circuit Short to Ground B1957 - Seat Front Up/Down Position Feedback Circuit Short to Ground B1961 - Seat Recline Forward/Backward Position Feedback Circuit Short to Ground B1965 - Seat Horizontal Forward/Rearward Position Feedback Circuit Short to GroundIf a short to ground or open condition is present on the affected motor's position sensor (Hall effect) feedback circuit, the DTC is set. After a DTC is set, a memory recall is not possible but the seat control switch can operate the associated motor in one second increments.

DTC DESCRIPTION AND FAULT TRIGGER CONDITIONS

This pinpoint test is intended to diagnose the following

  1. Wiring, terminals or connectors
  2. Memory SET switch
  3. Missing status information (Controller Area Network (CAN) communication bus messages): ignition switch status gear selector position
  4. Remote entry transmitter
  5. Memory power seat track
  6. Seat recliner motor
  7. DSM

The Driver Seat Module (DSM) receives a key out command over the Medium Speed Controller Area Network (MS-CAN) communication network and powers the driver seat rearward about 51 mm (2 in).

This pinpoint test is intended to diagnose the following

  1. Easy entry/exit feature is not enabled
  2. Missing status information (Controller Area Network (CAN) communication bus messages) to the DSM : ignition switch status gear selector position
  3. Wiring, terminals or connectors
  4. Faulty key-in-ignition warning switch
  5. DSM

The heated seat module receives ignition voltage, battery voltage and ground. The HVAC module supplies a momentary ground signal to the heated seat module on circuit CHS29 to request the system ON or OFF. The heated seat module supplies voltage to the heater mats on circuit CHS02 and ground is supplied on circuit GD904. The cushion and backrest heater mats are connected in series and operate together. The heated seat module supplies a reference voltage to the temperature sensor on circuit VHS26 and return on circuit RHS05.

The Front Controls Interface Module (FCIM) and the HVAC module communicate on the Controller Area Network (CAN).

The heated seat module faults will only be detected when the module is operating in the LOW or HIGH state. If a fault is detected by the heated seat module, the module will stop supplying power to that individual left or right seat as well as the switch indicator on which that fault was detected. Reset the module by cycling the ignition OFF and ON. The heated seat module does not report DTCs and does not communicate on the CAN .

The heated seat module faults detected will be

  1. a heater feed circuit short to battery, ground or open.
  2. sensor circuit short to battery or open.
  3. heated seat switch stuck closed to ground.

The HVAC module reports the following DTCs for the driver heated seat. These DTCs are for request circuit CHS29.

  1. DTC B1030:11 (Left Front Seat Heater: Circuit Short To Ground) - If the driver seat request circuit from the HVAC module to the heated seat module is shorted to ground, the DTC is set.
  2. DTC B1030:12 (Left Front Seat Heater: Circuit Short To Battery) - If the driver seat control circuit from the HVAC module to the heated seat module is shorted to voltage, the DTC is set in the HVAC module.
  3. DTC B1030:13 (Left Front Seat Heater: Circuit Open) - If the driver seat request circuit from the HVAC module to the heated seat module is open, the DTC is set.

This pinpoint test is intended to diagnose the following

  1. Fuse(s)
  2. Wiring, terminals or connectors
  3. Backrest or cushion heater mat
  4. Heated seat module
  5. HVAC module
  6. FCIM
  7. CAN

The heated seat module receives ignition voltage, battery voltage and ground. The HVAC module supplies a momentary ground signal to the heated seat module on circuit CHS30 to request the system ON or OFF. The heated seat module supplies voltage to the heater mats on circuit CHS07 and ground is supplied on circuit GD904. The cushion and backrest heater mats are connected in series and operate together. The heated seat module supplies a reference voltage to the temperature sensor on circuit VHS27 and return on circuit RHS05.

The Front Controls Interface Module (FCIM) and the HVAC module communicate on the Controller Area Network (CAN).

After a fault is set in the heated seat module, it is reset by cycling the ignition OFF and ON. The heated seat module faults detected will be

  1. a heater feed circuit short to battery, ground or open.
  2. sensor circuit short to battery or open.
  3. heated seat switch stuck closed to ground.

The HVAC module reports the following DTCs for the passenger heated seat. These DTCs are for request circuit CHS30.

  1. DTC B1032:11 (Right Front Seat Heater: Circuit Short to Ground) - If the passenger seat request circuit from the HVAC module to the heated seat module is shorted to ground, the DTC is set.
  2. DTC B1032:12 (Right Front Seat Heater: Circuit Short to Battery) - If the passenger seat control circuit from the HVAC module to the heated seat module is shorted to voltage, the DTC is set in the HVAC module.
  3. DTC B1032:13 (Right Front Seat Heater: Circuit Open) - If the passenger seat control circuit from the HVAC module to the heated seat module is open, the DTC is set.

This pinpoint test is intended to diagnose the following

  1. Fuse(s)
  2. Wiring, terminals or connectors
  3. Backrest or cushion heater mat
  4. Heated seat module
  5. HVAC module
  6. FCIM
  7. CAN

Upon receiving a command from the HVAC module, the heated seat module will decrease one setting (the sequence is high, low, off, high). Circuits CHS04 (YE/GY) and CHS13 (VT/BN) supply voltage from the heated seat module to the HVAC module to operate the indicators. When the HVAC module receives voltage, it then sends a Controller Area Network (CAN) message to the Front Controls Interface Module (FCIM) to illuminate the appropriate indicators. The high indicator circuit can be inoperative and both indicators will still cycle correctly. When a heated seat is set to high, both indicators on the heated seat control button will illuminate. When a heated seat is set to low, only the lower indicator will illuminate. When a heated seat is set to off, neither will be illuminated.

This pinpoint test is intended to diagnose the following

  1. Wiring, terminals or connectors
  2. Heated seat module
  3. FCIM
  4. HVAC module

Upon receiving a command from the HVAC module, the heated seat module will decrease one setting (the sequence is high, low, off, high). Circuits CHS09 (GY) and CHS14 (GN) supply voltage from the heated seat module to the HVAC module to operate the indicators. When the HVAC module receives voltage, it then sends a Controller Area Network (CAN) message to the Front Controls Interface Module (FCIM) to illuminate the appropriate indicators. The high indicator circuit can be inoperative and both indicators will still cycle correctly. When a heated seat is set to high, both indicators on the heated seat control button will illuminate. When a heated seat is set to low, only the lower indicator will illuminate. When a heated seat is set to off, neither will be illuminated.

This pinpoint test is intended to diagnose the following

  1. Wiring, terminals or connectors
  2. Heated seat module
  3. FCIM
  4. HVAC module

Each second row power-fold seat receives battery voltage from the Smart Junction Box (SJB) circuit SBP18 (YE/RD) (hot at all times) and is connected to ground. The power-fold seat motors contain internal switching that operate the motor until it moves to the reset position and turns off. The demand lighting/battery saver voltage output circuit CLN09 (YE/GN) from the SJB provides the control signal voltage to each seat control switch. The seat control switches are momentary contact switches when pressed and held for at least one second supply switched voltage to the power-fold seat motor control circuit CPS56 (GN/BN) or CPS57 (GY/BN) to initiate a pull and release cycle. The power-fold seat motor retracts a release cable connected to the same mechanical release lever in the seat latch mechanism as the manual release pull strap. When the power-fold seat motor is cycled, the pull strap retraction and release/reset will be noticeable.

This pinpoint test is intended to diagnose the following

  1. Fuse(s)
  2. Wiring, terminals or connectors
  3. Power-fold switch
  4. Power-fold seat actuator
  5. Seat recliner
  6. Seat track
  7. Gas assist strut

Each second row power-fold seat receives battery voltage from the Smart Junction Box (SJB) circuit SBP18 (YE/RD) (hot at all times) and is connected to ground. The power-fold seat motors contain internal switching that operate the motor until it moves to the reset position and turns off. The demand lighting/battery saver voltage output circuit from the SJB provides the control signal voltage to each seat control switch. The seat control switches are momentary contact switches when pressed and held for at least one second supply switched voltage to the power-fold seat motor control circuit to initiate a pull and release cycle. The power-fold seat motor retracts a release cable connected to the same mechanical release lever in the seat latch mechanism as the manual release pull strap. When the power-fold seat motor is cycled, the pull strap retraction and release/reset will be noticeable.

This pinpoint test is intended to diagnose the following

  1. Fuse(s)
  2. Wiring, terminals or connectors
  3. Latch(es)
  4. Release cable(s)
  5. Latch release pull strap
  6. Power-fold seat actuator
  7. SJB

The heated seat module receives ignition voltage on circuit CBP35 (YE/GY), battery voltage on circuit SBP40 (VT/RD) and is supplied ground on circuit GD133 (BK). When ignition voltage is supplied and the driver or passenger heated seat button on the rear HVAC module is pressed, a momentary ground signal is sent to the heated seat module to command the system on or off. Upon receiving a signal, the heated seat module will decrease one setting (the sequence is high, low, off, high). The heated seat module monitors temperature sensors contained within the cushion heater mats on the left and right rear seats. The temperature sensors share return circuit RHS41 (GN/BN) to the heated seat module. If the temperature sensor return circuit opens (resistance greater than 300,000 ohms), the heated seat module will disable the outputs to both seats. The system will remain disabled until the circuit is repaired and the heated seat module is reset by cycling the ignition OFF and ON.

This pinpoint test is intended to diagnose the following

  1. Fuse(s)
  2. Wiring, terminals or connectors
  3. Heated seat module

Scheme 1

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  1. T1 CHECK THE VOLTAGE TO THE REAR HEATED SEAT MODULE Disconnect: Heated Seat Module C3304b. Ignition ON. Measure the voltage between: heated seat module C3304b-2, circuit CBP35 (YE/GY), harness side and ground. heated seat module C3304b-1, circuit SBP40 (VT/RD), harness side and ground. Are the voltages greater than 10 volts? Yes: GO to T2 . No: VERIFY Smart Junction Box (SJB) fuses 40 (20A) and 35 (10A) are OK. If OK, REPAIR the affected circuit. If not OK, REFER to the «SYSTEM WIRING DIAGRAMS»(ref-360982) to identify the possible causes of the circuit short. TEST the system for normal operation.
  2. T2 CHECK THE HEATED SEAT MODULE GROUND CIRCUIT FOR AN OPEN Ignition OFF. Measure the resistance between heated seat module C3304b-5, circuit GD133 (BK), harness side and ground. Is the resistance less than 5 ohms? Yes: GO to T3 . No: REPAIR the circuit. TEST the system for normal operation.
  3. T3 CHECK TEMPERATURE SENSOR CIRCUITS FOR A SHORT TO VOLTAGE Disconnect: Heated Seat Module C3304a. Ignition ON. Measure the voltage between: heated seat module C3304a-3, circuit VHS42 (GN), harness side and ground. heated seat module C3304a-9, circuit VHS45 (GY/BN), harness side and ground. Is voltage present on either circuit? Yes: REPAIR the affected circuit. TEST the system for normal operation. No: GO to T4 .
  4. T4 CHECK TEMPERATURE SENSOR CIRCUITS FOR A SHORT TO GROUND Ignition OFF. Measure the resistance between: heated seat module C3304a-3, circuit VHS42 (GN), harness side and ground. heated seat module C3304a-9, circuit VHS45 (GY/BN), harness side and ground. Are the resistances greater than 10,000 ohms? Yes: GO to T5 . No: REPAIR the affected circuit. TEST the system for normal operation.
  5. T5 CHECK THE TEMPERATURE SENSOR RETURN CIRCUIT FOR AN OPEN Measure the resistance between heated seat module C3304a-12, circuit RHS41 (GN/BN), harness side and left rear heated seat C3304a-3, circuit VHS42 (GN), harness side. Is the resistance between 300 and 300,000 ohms? Yes: GO to T6 . No: REPAIR circuit RHS41. TEST the system for normal operation.
  6. T6 CHECK THE HVAC MODULE OUTPUT Connect: Heated Seat Module C3304a. Connect: Heated Seat Module C3304b. Ignition ON. NOTE: The following measurement must be taken by back-probing the heated seat module C3304a. NOTE: The voltage on circuit CHS47 (VT/GN) should drop momentarily when the driver heated seat control button is pressed. Measure the voltage between heated seat module C3304a-2, circuit CHS47 (VT/GN), harness side and ground by back-probing heated seat module C3304a-2. Press the driver heated seat control button on the HVAC module and note the voltage. Is the voltage greater than 10 volts before pressing the driver heated seat control button, then momentarily drops when the heated seat control button is pressed? Yes: INSTALL a new heated seat module. REFER to «HEATED SEAT MODULE - REAR»(ref-372788-S06849635552010093000000) . TEST the system for normal operation. No: If the voltage is greater than 10 volts but did not drop when the driver heated seat button was pressed, INSTALL a new HVAC module. Refer to «CLIMATE CONTROL»(ref-372816) . If the voltage is less than 10 volts, INSTALL a new heated seat module. REFER to «HEATED SEAT MODULE - REAR»(ref-372788-S06849635552010093000000) . TEST the system for normal operation.

The heated seat module receives constant battery voltage on circuit SBP40 (VT/RD). When ignition voltage is supplied and the driver heated seat button on the HVAC module is pressed, a momentary ground signal is sent to the heated seat module on command circuit CHS47 (VT/GN) to turn the system on or off. Upon receiving a signal, the heated seat module will decrease one setting (the sequence is high, low, off, high). The heated seat module supplies voltage to the cushion and backrest heater mats. The cushion and backrest heater mats are connected in series and operate together. Temperature is maintained by a temperature sensor contained within the cushion heater mat. The heated seat module supplies a reference voltage to the temperature sensor and monitors the signal to control current flow to the heater mats.

This pinpoint test is intended to diagnose the following

  1. Fuse(s)
  2. Wiring, terminals or connectors
  3. Backrest or cushion heater mat
  4. Rear HVAC module
  5. Rear heated seat module

Scheme 4

Scheme 4: PINPOINT TEST U: THE HEATED SEAT IS INOPERATIVE/DOES NOT OPERATE CORRECTLY - LEFT REAR
Scheme 4: PINPOINT TEST U: THE HEATED SEAT IS INOPERATIVE/DOES NOT OPERATE CORRECTLY - LEFT REAR

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Scheme 11

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Scheme 12

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Scheme 13

Scheme 13
Scheme 13
  1. U1 CHECK THE VOLTAGE TO THE REAR HEATED SEAT MODULE Disconnect: Heated Seat Module C3304b. Measure the voltage between: heated seat module C3304b-1, circuit SBP40 (VT/RD), harness side and ground. Is the voltage greater than 10 volts? Yes: GO to U2 . No: REPAIR the circuit. TEST the system for normal operation.
  2. U2 CHECK LEFT REAR HEATER MATS RESISTANCE AND HEATER CIRCUITS FOR AN OPEN Measure the resistance between rear heated seat module C3304b-4, circuit CHS39 (GN/BU), harness side and ground. Is the resistance between 1.2 and 4 ohms? Yes: GO to U7 . No: GO to U3 .
  3. U3 CHECK LEFT REAR SEAT CUSHION HEATER CIRCUIT FOR AN OPEN AND SHORT TO GROUND Disconnect: Driver Seat Cushion Heater Mat C3167. Measure the resistance between: heated seat module C3304b-4, circuit CHS39 (GN/BU), harness side and driver seat cushion heater mat C3167-1, circuit CHS39 (GN/BU), harness side. heated seat module C3304b-4, circuit CHS39 (GN/BU), harness side and ground. Is the resistance less than 5 ohms between heated seat module and cushion heater mat and greater than 10,000 ohms between the heated seat module and ground? Yes: GO to U4 . No: REPAIR the circuit. TEST the system for normal operation.
  4. U4 CHECK LEFT REAR HEATER MATS GROUND CIRCUIT FOR AN OPEN Disconnect: Backrest Heater Mat C3168. Measure the resistance between left rear backrest heater mat C3168-1, circuit GD149 (BK/GY), harness side and ground. Is the resistance less than 5 ohms? Yes: GO to U5 . No: REPAIR the circuit. TEST the system for normal operation.
  5. U5 CHECK LEFT REAR CUSHION HEATER MAT FOR AN OPEN Measure the resistance between left rear cushion heater mat C3167 pins 1 and 4, component side. Is the resistance between 0.6 and 2 ohms? Yes: GO to U6 . No: INSTALL a new left rear cushion heater mat. REFER to «SEAT CUSHION HEATER MAT - SECOND ROW, 40 PERCENT»(ref-372788-S09634224122010093000000) . TEST the system for normal operation.
  6. U6 CHECK LEFT REAR BACKREST HEATER MAT FOR AN OPEN Measure the resistance between left rear backrest heater C3168 pins 1 and 2, component side. Is the resistance between 0.6 and 2 ohms? Yes: REPAIR circuit CHS40 (GY/VT). TEST the system for normal operation. No: INSTALL a new rear seat backrest heater mat. REFER to «SEAT BACKREST HEATER MAT - SECOND ROW, 40 PERCENT»(ref-372788-S02492982552010093000000) . TEST the system for normal operation.
  7. U7 CHECK TEMPERATURE SENSOR CIRCUIT FOR A SHORT TO VOLTAGE Disconnect: Heated Seat Module C3304a. Ignition ON. Measure the voltage between rear heated seat module C3304a-3, circuit VHS42 (GN), harness side and ground. Is any voltage present? Yes: REPAIR the circuit. GO to U10 to check the temperature sensor. TEST the system for normal operation. No: GO to U8 .
  8. U8 CHECK HEATED SEAT TEMPERATURE SENSOR CIRCUITS FOR AN OPEN AND SHORT TO GROUND Ignition OFF. Measure the resistance between: rear heated seat module C3304a-3, circuit VHS42 (GN), harness side and C3304a-12, circuit RHS41 (GN/BN), harness side. rear heated seat module C3304a-3, circuit VHS42 (GN), harness side and ground. Is the resistance greater than 300 and less than 300,000 ohms between C3304a-3 and C3304a-12 and greater than 10,000 ohms between C3304a-3 and ground? Yes: GO to U11 . No: GO to U9 .
  9. U9 CHECK HEATED SEAT TEMPERATURE SENSOR CIRCUIT FOR AN OPEN AND SHORT TO GROUND Disconnect: Driver Seat Cushion Heater Mat C3167. Measure the resistance between: rear heated seat module C3304a-3, circuit VHS42 (GN), harness side and rear seat cushion heater mat C3167-2, circuit VHS42 (GN), harness side. rear heated seat module C3304a-3, circuit VHS42 (GN), harness side and ground. Is the resistance less than 5 ohms between C3304a-3 and C3167-2, and greater than 10,000 ohms between C3304a-3 and ground? Yes: GO to U10 . No: REPAIR the circuit. TEST the system for normal operation.
  10. U10 CHECK TEMPERATURE SENSOR FOR AN OPEN Measure the resistance between rear heated seat cushion C3167 pin 2 and pin 3, component side. Is the resistance between 300 ohms and 300,000 ohms? Yes: REPAIR circuit RHS41 (GN/BN). TEST the system for normal operation. No: INSTALL a new rear seat cushion heater mat. REFER to «SEAT CUSHION HEATER MAT - SECOND ROW, 40 PERCENT»(ref-372788-S09634224122010093000000) . TEST the system for normal operation.
  11. U11 CHECK HEATED SEAT MODULE COMMAND CIRCUIT FOR SHORT TO VOLTAGE Disconnect: Rear HVAC C3198. Ignition ON. Measure the voltage between heated seat module C3304a-2, circuit CHS47 (VT/GN), harness side and ground. Is any voltage present? Yes: REPAIR the circuit. TEST the system for normal operation. No: GO to U12 .
  12. U12 CHECK HEATED SEAT MODULE COMMAND CIRCUIT FOR A SHORT TO GROUND Ignition OFF. Measure the resistance between heated seat module C3304a-2, circuit CHS47 (VT/GN), harness side and ground. Is the resistance greater than 10,000 ohms? Yes: GO to U13 . No: REPAIR the circuit. TEST the system for normal operation.
  13. U13 CHECK HEATED SEAT MODULE COMMAND CIRCUIT FOR AN OPEN Measure the resistance between heated seat module C3304a-2, circuit CHS47 (VT/GN), harness side and HVAC module C3198-16, circuit CHS47 (VT/GN), harness side. Is the resistance less than 5 ohms? Yes: GO to U14 . No: REPAIR the circuit. TEST the system for normal operation.
  14. U14 CHECK THE HVAC MODULE OUTPUT Connect: HVAC Module C3198. Connect: Heated Seat Module C3304a. Connect: Heated Seat Module C3304b. Ignition ON. NOTE: The following measurement must be taken by back-probing the heated seat module C3304a. NOTE: The voltage on circuit CHS47 (VT/GN) should drop momentarily when the driver heated seat control button is pressed. Measure the voltage between heated seat module C3304a-2, circuit CHS47 (VT/GN), harness side and ground by back-probing heated seat module C3304a-2. Press the driver heated seat control button on the HVAC module and note the voltage. Is the voltage greater than 10 volts before pressing the driver heated seat control button, then momentarily drops when the heated seat control button is pressed? Yes: INSTALL a new heated seat module. REFER to «HEATED SEAT MODULE - REAR»(ref-372788-S06849635552010093000000) . TEST the system for normal operation. No: If the voltage is greater than 10 volts but did not drop when the driver heated seat button was pressed, INSTALL a new HVAC module. Refer to «CLIMATE CONTROL»(ref-372816) . If the voltage is less than 10 volts, INSTALL a new heated seat module. REFER to «HEATED SEAT MODULE - REAR»(ref-372788-S06849635552010093000000) . TEST the system for normal operation.

The heated seat module receives constant battery voltage on circuit SBP40 (VT/RD). When ignition voltage is supplied and the driver heated seat button on the HVAC module is pressed, a momentary ground signal is sent to the heated seat module on command circuit CHS51 (YE/GY) to turn the system on or off. Upon receiving a signal, the heated seat module will decrease one setting (the sequence is high, low, off, high). The heated seat module supplies voltage to the cushion and backrest heater mats. The cushion and backrest heater mats are connected in series and operate together. Temperature is maintained by a temperature sensor contained within the cushion heater mat. The heated seat module supplies a reference voltage to the temperature sensor and monitors the signal to control current flow to the heater mats.

This pinpoint test is intended to diagnose the following

  1. Fuse(s)
  2. Wiring, terminals or connectors
  3. Backrest or cushion heater mat
  4. Rear HVAC module
  5. Rear heated seat module

Scheme 14

Scheme 14: PINPOINT TEST V: THE HEATED SEAT IS INOPERATIVE/DOES NOT OPERATE CORRECTLY - RIGHT REAR
Scheme 14: PINPOINT TEST V: THE HEATED SEAT IS INOPERATIVE/DOES NOT OPERATE CORRECTLY - RIGHT REAR

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Scheme 19

Scheme 19
Scheme 19
  1. V1 CHECK THE VOLTAGE TO THE REAR HEATED SEAT MODULE Disconnect: Heated Seat Module C3304b. Measure the voltage between: heated seat module C3304b-3, circuit SBP40 (VT/RD), harness side and ground. Is the voltage greater than 10 volts? Yes: GO to V2 . No: REPAIR the circuit. TEST the system for normal operation.
  2. V2 CHECK RIGHT REAR HEATER MATS RESISTANCE AND HEATER CIRCUITS FOR AN OPEN Measure the resistance between rear heated seat module C3304b-6, circuit CHS43 (GY/BU), harness side and ground. Is the resistance between 1.2 and 4 ohms? Yes: GO to V7 . No: GO to V3 .
  3. V3 CHECK LEFT REAR SEAT CUSHION HEATER CIRCUIT FOR AN OPEN AND SHORT TO GROUND Disconnect: Driver Seat Cushion Heater Mat C3169. Measure the resistance between: heated seat module C3304b-6, circuit CHS43 (GY/BU), harness side and passenger seat cushion heater mat C3169-1, circuit CHS43 (GY/BU), harness side. heated seat module C3304b-6, circuit CHS43 (GY/BU), harness side and ground. Is the resistance less than 5 ohms between heated seat module and cushion heater mat and greater than 10,000 ohms between the heated seat module and ground? Yes: GO to V4 . No: REPAIR the circuit. TEST the system for normal operation.
  4. V4 CHECK LEFT REAR HEATER MATS GROUND CIRCUIT FOR AN OPEN Disconnect: Backrest Heater Mat C3170. Measure the resistance between right backrest heater mat C3170-1, circuit GD145 (BK/BU), harness side and ground. Is the resistance less than 5 ohms? Yes: GO to V5 . No: REPAIR the circuit. TEST the system for normal operation.
  5. V5 CHECK RIGHT REAR CUSHION HEATER MAT FOR AN OPEN Measure the resistance between right rear cushion heater mat C3169 pins 1 and 4, component side. Is the resistance between 0.6 and 2 ohms? Yes: GO to V6 . No: INSTALL a new right rear cushion heater mat. REFER to «SEAT CUSHION HEATER MAT - SECOND ROW, 40 PERCENT»(ref-372788-S09634224122010093000000) . TEST the system for normal operation.
  6. V6 CHECK RIGHT REAR BACKREST HEATER MAT FOR AN OPEN Measure the resistance between right rear backrest heater C3170 pins 1 and 2, component side. Is the resistance between 0.6 and 2 ohms? Yes: REPAIR circuit CHS44 (GN/VT). TEST the system for normal operation. No: INSTALL a new rear seat backrest heater mat. REFER to «SEAT BACKREST HEATER MAT - SECOND ROW, 40 PERCENT»(ref-372788-S02492982552010093000000) . TEST the system for normal operation.
  7. V7 CHECK TEMPERATURE SENSOR CIRCUIT FOR A SHORT TO VOLTAGE Disconnect: Heated Seat Module C3304a. Ignition ON. Measure the voltage between rear heated seat module C3304a-9, circuit VHS45 (GY/BN), harness side and ground. Is any voltage present? Yes: REPAIR the circuit. TEST the system for normal operation. No: GO to V8 .
  8. V8 CHECK HEATED SEAT TEMPERATURE SENSOR CIRCUITS FOR AN OPEN AND SHORT TO GROUND Ignition OFF. Measure the resistance between: rear heated seat module C3304a-9, circuit VHS45 (GY/BN), harness side and C3304a-12, circuit RHS41 (GN/BN), harness side. rear heated seat module C3304a-9, circuit VHS45 (GY/BN), harness side and ground. Is the resistance greater than 300 and less than 300,000 ohms between C3304a-9 and C3304a-12 and greater than 10,000 ohms between C3304a-9 and ground? Yes: GO to V11 . No: GO to V9 .
  9. V9 CHECK HEATED SEAT TEMPERATURE SENSOR CIRCUIT FOR AN OPEN AND SHORT TO GROUND Disconnect: Driver Seat Cushion Heater Mat C3169. Measure the resistance between: rear heated seat module C3304a-9, circuit VHS45 (GY/BN), harness side and rear seat cushion heater mat C3169-2, circuit VHS45 (GY/BN), harness side. rear heated seat module C3304a-9, circuit VHS45 (GY/BN), harness side and ground. Is the resistance less than 5 ohms between C3304a-9 and C3169-2, and greater than 10,000 ohms between C3304a-9 and ground? Yes: GO to V10 . No: REPAIR the circuit. TEST the system for normal operation.
  10. V10 CHECK THE TEMPERATURE SENSOR FOR AN OPEN Measure the resistance between rear heated seat cushion C3169 pin 2 and pin 3, component side. Is the resistance between 300 ohms and 300,000 ohms? Yes: REPAIR ground circuit RHS41 (GN/BN). TEST the system for normal operation. No: INSTALL a new rear seat cushion heater mat. REFER to «SEAT CUSHION HEATER MAT - SECOND ROW, 40 PERCENT»(ref-372788-S09634224122010093000000) . TEST the system for normal operation.
  11. V11 CHECK HEATED SEAT MODULE COMMAND CIRCUIT FOR SHORT TO VOLTAGE Disconnect: Rear HVAC C3198. Ignition ON. Measure the voltage between heated seat module C3304a-8, circuit CHS51 (YE/GY), harness side and ground. Is any voltage present? Yes: REPAIR the circuit. TEST the system for normal operation. No: GO to V12 .
  12. V12 CHECK HEATED SEAT MODULE COMMAND CIRCUIT FOR A SHORT TO GROUND Ignition OFF. Measure the resistance between heated seat module C3304a-8, circuit CHS51 (YE/GY), harness side and ground. Is the resistance greater than 10,000 ohms? Yes: GO to V13 . No: REPAIR the circuit. TEST the system for normal operation.
  13. V13 CHECK HEATED SEAT MODULE COMMAND CIRCUIT FOR AN OPEN Measure the resistance between heated seat module C3304a-8, circuit CHS51 (YE/GY), harness side and HVAC module C3198-13, circuit CHS51 (YE/GY), harness side. Is the resistance less than 5 ohms? Yes: GO to V14 . No: REPAIR the circuit. TEST the system for normal operation.
  14. V14 CHECK THE HVAC MODULE OUTPUT Connect: HVAC Module C3198. Connect: Heated Seat Module C3304a. Connect: Heated Seat Module C3304b. Ignition ON. NOTE: The following measurement must be taken by back-probing the heated seat module C3304a. NOTE: The voltage on circuit CHS51 (YE/GY) should drop momentarily when the driver heated seat control button is pressed. Measure the voltage between heated seat module C3304a-8, circuit CHS51 (YE/GY), harness side and ground by back-probing heated seat module C3304a-8. Press the driver heated seat control button on the HVAC module and note the voltage. Is the voltage greater than 10 volts before pressing the driver heated seat control button, then momentarily drops when the heated seat control button is pressed? Yes: INSTALL a new heated seat module. REFER to «HEATED SEAT MODULE - REAR»(ref-372788-S06849635552010093000000) . TEST the system for normal operation. No: If the voltage is greater than 10 volts but did not drop when the driver heated seat button was pressed, INSTALL a new HVAC module. Refer to «CLIMATE CONTROL»(ref-372816) . If the voltage is less than 10 volts, INSTALL a new heated seat module. REFER to «HEATED SEAT MODULE - REAR»(ref-372788-S06849635552010093000000) . TEST the system for normal operation.

Upon receiving a pulsed ground from the rear HVAC module, the rear heated seat module will decrease one setting (the sequence is high, low, off, high). Circuits CHS49 (VT) and CHS48 (YE) between the rear heated seat module and rear HVAC module control the indicator operation. When voltage is supplied to the rear HVAC module on circuits CHS49 (VT) and CHS48 (YE) the appropriate indicator will illuminate. When a heated seat is set to high, both indicators on the heated seat control button will illuminate. When a heated seat is set to low, only the lower indicator will illuminate. When a heated seat is set to off, neither will be illuminated.

This pinpoint test is intended to diagnose the following

  1. Wiring, terminals or connectors
  2. Rear HVAC module
  3. Rear heated seat module

Scheme 20

Scheme 20: PINPOINT TEST W: THE HEATED SEAT DOES NOT OPERATE CORRECTLY - LEFT REAR SEAT DOES HEAT BUT THE HEATE
Scheme 20: PINPOINT TEST W: THE HEATED SEAT DOES NOT OPERATE CORRECTLY - LEFT REAR SEAT DOES HEAT BUT THE HEATE

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Scheme 23
Scheme 23
  1. W1 CHECK THE INDICATOR CIRCUITS FOR A SHORT TO GROUND Disconnect: Rear HVAC Module C3198. Disconnect: Heated Seat Module C3304a. Measure the resistance between: heated seat module C3304a-4, circuit CHS49 (VT), harness side and ground. heated seat module C3304a-5, circuit CHS48 (YE), harness side and ground. Are the resistances greater than 10,000 ohms? Yes: GO to W2 . No: REPAIR the affected circuit. TEST the system for normal operation.
  2. W2 CHECK THE INDICATOR CIRCUITS FOR AN OPEN Measure the resistance between: rear heated seat module C3304a-4, circuit CHS49 (VT), harness side and rear HVAC module C3198-14, circuit CHS49 (VT), harness side. rear heated seat module C3304a-5, circuit CHS48 (YE), harness side and rear HVAC module C3198-15, circuit CHS48 (YE), harness side. Are the resistances less than 5 ohms? Yes: GO to W3 . No: REPAIR the affected circuit. TEST the system for normal operation.
  3. W3 CHECK THE HEATED SEAT HIGH INDICATOR Connect: Rear HVAC Module C3198. Disconnect: Heated Seat Module C3304b. Ignition ON. Connect a fused jumper lead between rear heated seat module C3304a-5, circuit CHS48 (YE), harness side and C3304b-1, circuit SBP40 (VT/RD), harness side. Does the high indicator illuminate on the rear HVAC module? Yes: GO to W4 . No: INSTALL a new HVAC module. Refer to «CLIMATE CONTROL SYSTEM - GENERAL INFORMATION AND DIAGNOSTICS»(ref-372762) .
  4. W4 CHECK THE HEATED SEAT LOW INDICATOR Connect a fused jumper lead between heated seat module C3304a-4, circuit CHS49 (VT), harness side and C3304b-1, circuit SBP40 (VT/RD), harness side. Does the low indicator illuminate on the rear HVAC module? Yes: INSTALL a new heated seat module. REFER to «HEATED SEAT MODULE - REAR»(ref-372788-S06849635552010093000000) . TEST the system for normal operation. No: INSTALL a new rear HVAC module. Refer to «CLIMATE CONTROL SYSTEM - GENERAL INFORMATION AND DIAGNOSTICS»(ref-372762) . TEST the system for normal operation.

Upon receiving a pulsed ground from the rear HVAC module, the rear heated seat module will decrease one setting (the sequence is high, low, off, high). Circuits CHS53 (WH/BN) and CHS52 (BU) between the rear heated seat module and rear HVAC module control the indicator operation. When voltage is supplied to the rear HVAC module on circuits CHS53 (WH/BN) and CHS52 (BU) the appropriate indicator will illuminate. When a heated seat is set to high, both indicators on the heated seat control button will illuminate. When a heated seat is set to low, only the lower indicator will illuminate. When a heated seat is set to off, neither will be illuminated.

This pinpoint test is intended to diagnose the following

  1. Wiring, terminals or connectors
  2. Rear HVAC module
  3. Rear heated seat module

Scheme 24

Scheme 24: PINPOINT TEST X: THE HEATED SEAT DOES NOT OPERATE CORRECTLY - RIGHT REAR SEAT DOES HEAT BUT THE HEAT
Scheme 24: PINPOINT TEST X: THE HEATED SEAT DOES NOT OPERATE CORRECTLY - RIGHT REAR SEAT DOES HEAT BUT THE HEAT

Scheme 25

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Scheme 26
Scheme 26
  1. X1 CHECK THE INDICATOR CIRCUITS FOR A SHORT TO GROUND Disconnect: HVAC Module C3198. Disconnect: Heated Seat Module C3304a. Measure the resistance between: heated seat module C3304a-10, circuit CHS53 (WH/BN), harness side and ground. heated seat module C3304a-11, circuit CHS52 (BU), harness side and ground. Are the resistances greater than 10,000 ohms? Yes: GO to X2 . No: REPAIR the affected circuit. TEST the system for normal operation.
  2. X2 CHECK THE INDICATOR CIRCUITS FOR AN OPEN Measure the resistance between: rear HVAC module C3198-11, circuit CHS53 (WH/BN), harness side and heated seat module C3304a-10, circuit CHS53 (WH/BN), harness side. rear HVAC module C3198-12, circuit CHS52 (BU), harness side and heated seat module C3304a-11, circuit CHS52 (BU), harness side. Are the resistances less than 5 ohms? Yes: GO to X3 . No: REPAIR the affected circuit. TEST the system for normal operation.
  3. X3 CHECK THE HEATED SEAT HIGH INDICATOR Connect: Rear HVAC Module C3198. Disconnect: Heated Seat Module C3304b. Ignition ON. Connect a fused jumper lead between heated seat module C3304a-11, circuit CHS52 (BU), harness side and C3304b-3, circuit SBP40 (VT/RD), harness side. Does the high indicator illuminate on the rear HVAC module? Yes: GO to X4 . No: INSTALL a new HVAC module. Refer to «CLIMATE CONTROL SYSTEM - GENERAL INFORMATION AND DIAGNOSTICS»(ref-372762) .
  4. X4 CHECK THE HEATED SEAT LOW INDICATOR Connect a fused jumper lead between heated seat module C3304a-10, circuit CHS53 (WH/BN), harness side and C3304b-3, circuit SBP40 (VT/RD), harness side. Does the low indicator illuminate on the rear HVAC module? Yes: INSTALL a new heated seat module. REFER to «HEATED SEAT MODULE - REAR»(ref-372788-S06849635552010093000000) . TEST the system for normal operation. No: INSTALL a new rear HVAC module. Refer to «CLIMATE CONTROL SYSTEM - GENERAL INFORMATION AND DIAGNOSTICS»(ref-372762) .

Pressing the left rear heated seat switch once in either the high or low mode will command on the left rear heated seat. Voltage is then supplied to the left rear heated seat switch from the heated seat module on either circuit CHS48 (YE) (high heat mode) or circuit CHS49 (VT) (low heat mode) illuminating the switch indicator. Pressing the left rear heated seat switch again in the mode that is currently on will set the left rear heated seat to off and also turn that LED off.

This pinpoint test is intended to diagnose the following

  1. Wiring, terminals or connectors
  2. Heated seat module

Pressing the right rear heated seat switch once in either the high or low mode will command on the left rear heated seat. Voltage is then supplied to the rear the heated seat module on either circuit CHS52 (BU) (high heat mode) or circuit CHS53 (WH/BN) (low heat mode) illuminating the switch indicator. Pressing the right rear heated seat switch again in the mode that is currently on will set the right rear heated seat to off and also turn that LED off.

This pinpoint test is intended to diagnose the following

  1. Wiring, terminals or connectors
  2. Heated seat module

The seat recliner contains a safety mechanism to prevent the backrest from being raised upright until the seat latches are latched to the strikers on the floor. When the backrest is folded down, the safety mechanism is engaged by the cable attached to the outboard latch foot and outboard recliner. The safety mechanism is disengaged when the seat latch feet are completely locked around the strikers allowing the backrest to be raised upright.

The safety belt retractor in the backrest uses a stop button in the safety belt webbing to prevent the webbing from retracting too far into the retractor. If the web stop button is damaged or missing and the seat backrest is lowered, the safety belt webbing may retract farther than intended and may also prevent the backrest from being raised fully upright. A service kit is available for web stop button installation.

This pinpoint test is intended to diagnose the following

  1. Safety belt web stop button missing
  2. Inboard recliner
  3. Outboard recliner

Pulling the seat recliner handle releases the backrest for recline positions and to fold down. When the backrest is folded fully down, pulling the recliner handle again to the second stop position releases the seat latch feet from the strikers for the E-Z entry position. The inboard and outboard recliners operate in a synchronized manner and both will lock the backrest when upright. The outboard recliner is released directly by the recliner lever while the inboard recliner is released by a cable attached to the recliner lever.

This pinpoint test is intended to diagnose the following

  1. Recliner cable disconnected or damaged
  2. Outboard recliner
  3. Inboard recliner

Pulling the seat recliner handle releases the backrest for recline positions and to fold down. When the backrest is folded fully down, pulling the recliner handle again to the second stop position releases the seat latch feet from the strikers for the E-Z entry position. The inboard and outboard recliners operate in a synchronized manner and both will lock the backrest when upright. When folding the backrest down, the outboard recliner is released directly by the recliner lever while the inboard recliner is released by a cable attached to the outboard recliner. If the backrest is not folded all the way down, the seat will not release to the E-Z entry position.

The seat recliner contains a safety mechanism to prevent the backrest from being raised upright until the seat latches are latched to the strikers on the floor. When the backrest is folded down, the safety mechanism is engaged by the cable attached to the inboard latch foot and outboard recliner. The safety mechanism is disengaged when the seat latch feet are completely locked around the strikers allowing the backrest to be raised upright.

This pinpoint test is intended to diagnose the following

  1. Recliner cable disconnected or damaged
  2. Recliner

The Driver Seat Module (DSM) continuously monitors the input voltage for correct operation. If the DSM detects input voltage below 10 volts, it will store DTC B1318 in memory. If the DSM detects input voltage above 15 volts, it will store DTC B1317 in memory. If DTC B1317 or B1318 is set, the DSM disables the memory system outputs for the driver seat, memory mirrors and adjustable pedal operation.

  1. DTC B1317 (Battery Voltage High) - If the DSM detects voltage above 15 volts, the DTC is set.
  2. DTC B1318 (Battery Voltage Low) - If the DSM detects voltage below 10 volts, the DTC is set.

This pinpoint test is intended to diagnose the following

  1. Wiring, terminals or connectors
  2. DSM

The seat control switch is supplied battery voltage on circuit CBX05 (VT/RD) (non-memory seat) or CBX04 (WH/RD) (memory seat) and is supplied ground on circuit GD904 (BK/BU). When the lumbar button is pressed, voltage and ground are supplied to the power lumbar motor on circuits CPS18 (BN/GN) and CPS19 (GY/VT) to move the lumbar assembly in the desired direction.

This pinpoint test is intended to diagnose the following

  1. Wiring, terminals or connectors
  2. Lumbar control switch (part of seat control switch)
  3. Power lumbar motor assembly

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