Pinpoint Test N: The Heated Seat Is Inoperative/Does Not Operate Correctly - Right Rear
Seats
Pinpoint Test N: The Heated Seat is Inoperative/Does Not Operate Correctly - Right Rear
Refer to Wiring Diagram Set 119, Climate Controlled Seats for schematic and connector information. Diagrams By Number
Normal Operation
The heated seat module receives constant battery voltage on circuit SBB07 (WH/RD). When ignition voltage is supplied and the driver heated seat button on the Rear Heating Ventilation Air Conditioning (RHVAC) 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:
- Fuse(s)
- Wiring, terminals or connectors
- Backrest or cushion heater mat
- RHVAC module
- Rear heated seat module
PINPOINT TEST N: THE HEATED SEAT IS INOPERATIVE/DOES NOT OPERATE CORRECTLY - RIGHT REAR
-------------------------------------------------
N1 CHECK VOLTAGE TO THE REAR HEATED SEAT MODULE
- Disconnect: Heated Seat Module C3304B.
- Measure the voltage between:
- heated seat module C3304B-3, circuit SBB07 (WH/RD), harness side and ground.
- Is the voltage greater than 10 volts?
Yes
GO to N2.
No
REPAIR the circuit. TEST the system for normal operation.
-------------------------------------------------
N2 CHECK THE HEATED SEAT MODULE GROUND CIRCUIT FOR AN OPEN
- Ignition OFF.
- Measure the resistance between heated seat module C359B-5, circuit GD903 (BK/WH), harness side and ground.
- Is the resistance less than 5 ohms?
Yes
GO to N3.
No
REPAIR the circuit. TEST the system for normal operation.
DISCONNECT the battery ground cable.
CONNECT passenger seat safety belt buckle pretensioner C3066.
CONNECT passenger seat side air bag module C339.
CONNECT driver seat safety belt buckle pretensioner C3065.
CONNECT driver seat side air bag C3051.
REPOWER the SRS. REFER to Supplemental Restraint System Supplemental Restraint System (SRS) Depowering and Repowering.
-------------------------------------------------
N3 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 N8.
No
GO to N4.
-------------------------------------------------
N4 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 N5.
No
REPAIR the circuit. TEST the system for normal operation.
-------------------------------------------------
N5 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 GD148 (BK/YE), harness side and ground.
- Is the resistance less than 5 ohms?
Yes
GO to N6.
No
REPAIR the circuit. TEST the system for normal operation.
-------------------------------------------------
N6 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 N7.
No
INSTALL a new right rear cushion heater mat. REFER to Seat Cushion Heater Mat - Second Row, 40 Percent Seat Cushion Heater Mat - Second Row, 40 Percent. TEST the system for normal operation.
-------------------------------------------------
N7 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 Seat Backrest Heater Mat - Second Row, 40 Percent. TEST the system for normal operation.
-------------------------------------------------
N8 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 N9.
-------------------------------------------------
N9 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 N12.
No
GO to N10.
-------------------------------------------------
N10 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 N11.
No
REPAIR the circuit. TEST the system for normal operation.
-------------------------------------------------
N11 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 Seat Cushion Heater Mat - Second Row, 40 Percent. TEST the system for normal operation.
-------------------------------------------------
N12 CHECK HEATED SEAT MODULE COMMAND CIRCUIT FOR SHORT TO VOLTAGE
- Disconnect: RHVAC 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 N13.
-------------------------------------------------
N13 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 N14.
No
REPAIR the circuit. TEST the system for normal operation.
-------------------------------------------------
N14 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 RHVAC module C3198-10, circuit CHS51 (YE/GY), harness side.
- Is the resistance less than 5 ohms?
Yes
GO to N15.
No
REPAIR the circuit. TEST the system for normal operation.
-------------------------------------------------
N15 CHECK THE RHVAC MODULE OUTPUT
- Connect: RHVAC Module C3198.
- Connect: Heated Seat Module C3304A.
- Connect: Heated Seat Module C3304B.
- Start the engine.
- 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 RHVAC 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 - Second Row Heated Seat Module - Second Row. 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 RHVAC module. REFER to Climate Control Rear Heating Ventilation Air Conditioning (RHVAC) Module.
If the voltage is less than 10 volts, INSTALL a new heated seat module. REFER to Heated Seat Module - Second Row Heated Seat Module - Second Row.
TEST the system for normal operation.
-------------------------------------------------