B172E
DTC B172E or B172F
Diagnostic Instructions
* Perform the Diagnostic System Check - Vehicle Diagnostic System Check - Vehicle prior to using this diagnostic procedure.
* Review Strategy Based Diagnosis Strategy Based Diagnosis for an overview of the diagnostic approach.
* Diagnostic Procedure Instructions Diagnostic Procedure Instructions provides an overview of each diagnostic category.
DTC Descriptors
DTC B172E 01
- Driver Seat Cushion Left Rear Haptic Alert Motor Control Circuit Short to Voltage
DTC B172E 02
- Driver Seat Cushion Left Rear Haptic Alert Motor Control Circuit Short to Ground
DTC B172F 01
- Driver Seat Cushion Right Rear Haptic Alert Motor Control Circuit Short to Voltage
DTC B172F 02
- Driver Seat Cushion Right Rear Haptic Alert Motor Control Circuit Short to Ground
Diagnostic Fault Information
Circuit/System Description
The haptic seats, also known as Active Safety Seats, provide a vibration to alert the driver in certain circumstances. There are two motors in the driver's seat cushion. Either the right or left motor can run or both depending on the alert. The K40D Seat Memory Control Module - Driver provides the output voltage for the motors. The K40D Seat Memory Control Module - Driver receives serial data requests from other modules to activate the appropriate seat motors with the number of pulses requested. While the motors are activated, the K40D Seat Memory Control Module - Driver checks for either shorts to voltage or shorts to ground. Due to the nature of the PWM signal, if a motor circuit is open, it may be reported as either a short to voltage or short to ground.
Conditions for Running the DTC
* Engine ON.
* Haptic seat motor commanded ON.
Conditions for Setting the DTC
DTC B172E 01
The K40D Seat Memory Control Module - Driver has detected a short to voltage in the P45LR Seat Haptic Signal Motor - Driver Left Rear circuit.
DTC B172E 02
The K40D Seat Memory Control Module - Driver has detected a short to ground in the P45LR Seat Haptic Signal Motor - Driver Left Rear circuit.
DTC B172F 01
The K40D Seat Memory Control Module - Driver has detected a short to voltage in the P45RR Seat Haptic Signal Motor - Driver Right Rear circuit.
DTC B172F 02
The K40D Seat Memory Control Module - Driver has detected a short to ground in the P45RR Seat Haptic Signal Motor - Driver Right Rear circuit.
Action Taken When the DTC Sets
Alerts will be communicated with beeps.
Conditions for Clearing the DTC
* The condition responsible for setting the DTC no longer exists.
* A history DTC will clear once 100 consecutive malfunction-free ignition cycles have occurred.
Diagnostic Aids
The infotainment personalization menu allows the user to set alerts to be either haptic through the seats or audio beeps through the radio. Refer to the Owner's Manual to verify this setting.
Reference Information
Schematic Reference
Object Detection Schematics [1][2]Collision Avoidance and Parking Assist Systems
Connector End View Reference
Component Connector End Views Fuel Pump and Level Sensor Assembly
Description and Operation
Object Detection Description and Operation (with Active Safety System - UGN) Object Detection Description and Operation (with Active Safety System - UGN)Object Detection Description and Operation (with rear vision camera - UVC) Object Detection Description and Operation (with rear vision camera - UVC)Object Detection Description and Operation (with front and rear park assist - UD5) Object Detection Description and Operation (With Front and Rear Park Assist - UD5)Object Detection Description and Operation (with rear park assist - UD7) Object Detection Description and Operation (With Rear Park Assist - UD7)Object Detection Description and Operation (with side blind zone alert - UFT) Object Detection Description and Operation (with side blind zone alert - UFT)Object Detection Description and Operation (with rear cross traffic alert - UFG) Object Detection Description and Operation (With Rear Cross Traffic Alert - UFG)Object Detection Description and Operation (with lane departure warning - UFL) Object Detection Description and Operation (With Lane Departure Warning - UFL)Object Detection Description and Operation (with forward collision alert - UEU) Object Detection Description and Operation (With Forward Collision Alert - UEU)Object Detection Description and Operation (with Haptic Signal Motor Seat) Object Detection Description and Operation (with Haptic Signal Motor Seat)
Electrical Information Reference
* Circuit Testing Circuit Testing
* Connector Repairs Connector Repairs
* Testing for Intermittent Conditions and Poor Connections Testing for Intermittent Conditions and Poor Connections
* Wiring Repairs Wiring Repairs
Scan Tool Reference
Control Module References Control Module References for scan tool information
Circuit/System Verification
1. Ignition ON.
2. Verify the P45LR Seat Haptic Signal Motor - Driver Left Rear turns on and off when commanding the Driver Seat Cushion Left Rear Haptic Movement On and Off with a scan tool.
• If the motor does not function
Refer to Circuit/System Testing.
• If the motor functions
3. Verify the P45RR Seat Haptic Signal Motor - Driver Right Rear turns on and off when commanding the Driver Seat Cushion Right Rear Haptic Movement On and Off with a scan tool.
• If the motor does not function
Refer to Circuit/System Testing.
• If the motor functions
4. All OK.
Circuit/System Testing
1. Ignition OFF, disconnect the X6 harness connector at the K40D Seat Memory Control Module - Driver, ignition ON.
2. Test for less than 1 V between the appropriate control circuit terminal listed below and ground:
* Terminal 4 - P45RR Seat Haptic Signal Motor - Driver Right Rear
* Terminal 5 - P45LR Seat Haptic Signal Motor - Driver Left Rear
• If 1 V or greater
Repair the short to voltage on the circuit.
• If less than 1 V
3. Ignition OFF and all vehicle systems OFF. It may take up to 2 minutes for all vehicle systems to power down.
4. Test for 27-51 ohms between the appropriate control circuit terminal listed below and ground:
* Terminal 4 - P45RR Seat Haptic Signal Motor - Driver Right Rear
* Terminal 5 - P45LR Seat Haptic Signal Motor - Driver Left Rear
• If less than 27 ohms
Test or replace the appropriate P45 Seat Haptic Signal Motor - Driver.
• If greater than 51 ohms
1. Verify the circuit ground connection is clean and secure.
• If the ground connector is not clean or secure, repair as necessary.
• If the circuit ground connection is clean and secure
2. Replace the appropriate P45 Seat Haptic Signal Motor - Driver.
• If between 27-51 ohms
5. Install a 3 A fused jumper wire between the appropriate control circuit terminal listed below and B+.
* Terminal 4 - P45RR Seat Haptic Signal Motor - Driver Right Rear
* Terminal 5 - P45LR Seat Haptic Signal Motor - Driver Left Rear
6. Verify the appropriate P45 Seat Haptic Signal Motor - Driver turns on and off.
• If the P45 Seat Haptic Signal Motor - Driver does not turn on and off
Replace the appropriate P45 Seat Haptic Signal Motor - Driver.
• If the P45 Seat Haptic Signal Motor - Driver turn on and off
7. Ignition OFF, connect the harness connector at the K40D Seat Memory Control Module - Driver, ignition ON.
8. Verify the P45LR Haptic Signal Motor - Driver Left Rear turns on and off when commanding the Driver Seat Cushion Left Rear Haptic Movement On and Off with a scan tool.
• If the motor does not function
Replace the K40D Seat Memory Control Module - Driver.
• If the motor functions
9. Verify the P45RR Haptic Signal Motor - Driver Right Rear turns on and off when commanding the Driver Seat Cushion Right Rear Haptic Movement On and Off with a scan tool.
• If the motor does not function
Replace the K40D Seat Memory Control Module - Driver.
• If the motor functions
10. All OK.
Repair Instructions
Perform the Diagnostic Repair Verification Verification Tests after completing the repair.
* Front Seat Lane Departure Warning Actuator Replacement Service and Repair - Haptic Signal Motor replacement.
* Control Module References Control Module References for K40D Seat Memory Control Module - Driver replacement, programming and setup.