B1EB2-1B
B1EB2-1B-FRONT RIGHT SEAT HEATER SENSOR - CIRCUIT RESISTANCE ABOVE THRESHOLD
For a complete wiring diagram, refer to the Wiring Information.
- When Monitored:
When Heated Seat Module (HSM) is powered.
- Set Condition:
The Heated Seat Module (HSM) detects the signal from the Negative Temperature Coefficient (NTC) thermistor is above its threshold for more than two seconds.
Diagnostic Test
1. CHECK IF THE DTC IS ACTIVE
NOTE: Make sure the battery is fully charged and the charging system is operating properly before proceeding.
1. Turn the ignition on.
2. Using a scan tool, record and erase Diagnostic Trouble Codes (DTCs).
NOTE: It is recommended to record any Environmental Data to help identify the conditions in which the DTC was set.
3. Turn the ignition off.
4. Ignition on, engine running.
5. With the scan tool, read Heated Seat Module (HSM) DTCs.
Does the scan tool show this DTC as active?
Yes
- Go To 2
No
- Go To 6
2. CHECK THE (P688) RIGHT FRONT HEATED SEAT TEMP SENSE CIRCUIT FOR A SHORT TO VOLTAGE
1. Turn the ignition off.
2. Disconnect the HSM C2 harness connector.
3. Disconnect the HSM C3 harness connector (if equipped with rear heated seats).
4. Ignition on, engine running.
5. Measure the voltage between ground and the (P688) Right Front Heated Seat Temp Sense circuit at the HSM C2 harness connector.
Is there any voltage present?
Yes
- Repair the (P688) Right Front Heated Seat Temp Sense circuit or the (P968) Heated Seat Sensor Return circuit for a short to voltage.
- Perform the BODY VERIFICATION TEST. Body Verification Test .
No
- Go To 3
3. CHECK THE SEAT TEMPERATURE SENSOR RESISTANCE
1. Turn the ignition off.
2. Measure the resistance between the (P688) Right Front Heated Seat Temp Sense circuit and the (P968) Heated Seat Sensor Return circuit at the HSM C2 harness connector.
3. Compare the measured resistance to the Temperature Sensor Resistance chart.
Is the resistance within the specifications listed in the chart?
Yes
- Replace the Heated Seat Module (HSM). Heated Seat Module - Removal.
- Perform the BODY VERIFICATION TEST. Body Verification Test .
No
- Go To 4
4. CHECK THE (P688) RIGHT FRONT HEATED SEAT TEMP SENSE CIRCUIT OR AN OPEN
1. Disconnect the Right Seat Cushion Heater harness connector.
2. Measure the resistance of the (P688) Right Front Heated Seat Temp Sense circuit between the HSM C2 connector and the Right Seat Cushion Heater connector (harness side).
Is the resistance below 5.0 Ohms?
Yes
- Go To 5
No
- Repair the (P688) Right Front Heated Seat Temp Sense circuit for an open.
- Perform the BODY VERIFICATION TEST. Body Verification Test .
5. CHECK THE (P968) HEATED SEAT SENSOR RETURN CIRCUIT FOR AN OPEN
1. Measure the resistance of the (P968) Heated Seat Sensor Return circuit between the HSM C2 harness connector and the Right Seat Cushion Heater harness connector.
Is the resistance below 5.0 Ohms?
Yes
- Replace the Seat Temperature Sensor (part of the Seat Cushion Heater Element). Heater Pad - Removal.
- Perform the BODY VERIFICATION TEST. Body Verification Test .
No
- Repair the (P968) Heated Seat Sensor Return circuit for an open.
- Perform the BODY VERIFICATION TEST. Body Verification Test .
6. CHECK THE WIRING AND CONNECTORS
1. The conditions necessary to set the DTC are not present at this time.
2. Using the schematics as a guide, inspect the wiring and connectors specific to this circuit. Wiggle the wiring and connectors while checking for shorted and open circuits. Attempt to reproduce the condition by adjusting the seat(s).
3. Check all related splices and connectors for signs of water intrusion, corrosion, pushed out or bent terminals, and correct pin tension. Verify the seat wiring harness is routed correctly to the Heated Seat Module (HSM).
4. With the scan tool, check for any Environmental Data to help identify the conditions in which the DTC was set.
5. Check Service Bulletins for any possible causes that may apply.
Were there any problems found?
Yes
- Repair as necessary.
- Perform the BODY VERIFICATION TEST. Body Verification Test .
No
- Test complete.