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Home >> Chevy Truck >> 2012 >> Traverse AWD V6-3.6L >> Repair and Diagnosis >> A L L Diagnostic Trouble Codes ( DTC ) >> Testing and Inspection >> B Code Charts >> B2180 >> Without Memory A45

Without Memory A45




DTC B1935 or B2180 (Without Memory A45)

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 B1935 04

-
Left Seat Back Heater Circuit Open

DTC B1935 0A

-
Left Seat Back Heater Circuit Rate of Change Below Threshold

DTC B1935 0B

-
Left Seat Back Heater Circuit Current Above Threshold

DTC B1935 0C

-
Left Seat Back Heater Circuit Current Below Threshold

DTC B1935 0D

-
Left Seat Back Heater Circuit Resistance Above Threshold

DTC B1935 0E

-
Left Seat Back Heater Circuit Resistance Below Threshold

DTC B1935 1F

-
Left Seat Back Heater Circuit Intermittent

DTC B2180 04

-
Right Seat Back Heater Circuit Open

DTC B2180 0A

-
Right Seat Back Heater Circuit Rate of Change Below Threshold

DTC B2180 0B

-
Right Seat Back Heater Circuit Current Above Threshold

DTC B2180 0C

-
Right Seat Back Heater Circuit Current Below Threshold

DTC B2180 0D

-
Right Seat Back Heater Circuit Resistance Above Threshold

DTC B2180 0E

-
Right Seat Back Heater Circuit Resistance Below Threshold

DTC B2180 1F

-
Right Seat Back Heater Circuit Intermittent

Diagnostic Fault Information






Circuit/System Description

The left and right heated seats are controlled by the heated seat module (HSM). When active, power is applied to the seat cushion and back heater elements through a common voltage supply circuit. Each individual heater element is grounded by the HSM through separate low side drive control circuits. The heater element control circuits are pulse width modulated to ground by the module in order to control the seat temperature by regulating the current flow through the heater elements. The module then monitors the current flow through the heating elements and the of rate change of the temperature sensors to verify correct heated seat operation.

Conditions for Running the DTC

The HSM must be powered.

Conditions for Setting the DTC

The heated seat system must be active.

B1935 04, B2180 04

The HSM does not detect a temperature change for up to 210 seconds.

B1935 0A, B2180 0A

The HSM detects that the set point temperature has not been reached for up to 8.5 minutes.

B1935 0B, B1935 0E, B2180 0B, B2180 0E

By measuring the current and voltage output to the seat back heating element every 10 seconds, the HSM calculates that the heating element resistance is below the minimum resistance value of 3.5 ohms.

B1935 0C, B1935 0D, B2180 0C, B2180 0D

By measuring the current and voltage output to the seat back heating element every 10 seconds, the HSM calculates that the heating element resistance is above the maximum resistance value of 10 ohms.

B1935 1F, B2180 1F

The temperature sensor voltage is erratic or changes suddenly.

Action Taken When the DTC Sets

The heated seat back function for the appropriate seat will be disabled.

Conditions for Clearing the DTC

* The current DTC clears when the malfunction is no longer present and the power mode changes to OFF then back to ACC or RUN.

* The history DTC will clear after 50 consecutive fault-free ignition cycles have occurred.

Reference Information

Schematic Reference

Heated/Cooled Seat Schematics (Except A45) Heated/Cooled Seat SchematicsHeated/Cooled Seat Schematics (With KA1) Heated/Cooled Seat Schematics (With KA1)Heated/Cooled Seat Schematics (With KB6) Heated/Cooled Seat Schematics (With KB6)

Connector End View Reference

Component Connector End Views A/C Compressor Clutch

Description and Operation

Heated Seats Description and Operation Heated Seats

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 Programming and Relearning for scan tool information

Circuit/System Testing

B1935 0A, B1935 0B, B1935 0C, B1935 0D, B1935 0E, B1935 04, or B1935 1F

1. Ignition OFF, disconnect the X1 harness connector at the HSM.

Important:
When measuring the resistance, the resistance values are based on the seat being at room temperature of 20°C (68°F).


2. Test for 6.0-14.1 ohms between the control circuit terminal 3 and the control circuit terminal 1.

• If greater than the specified range, test the control circuits for an open/high resistance. If the circuits test normal, replace the seat back heating element/temperature sensor.

• If less than the specified range, test for a short between the control circuits. If the circuits test normal, replace the seat back heating element/temperature sensor.

3. Ignition OFF, disconnect the X2, X4 harness connectors at the HSM.

4. Test for 3.3K-300K ohms between the signal circuit terminal 19 X4 and the low reference circuit terminal 5 X2.

• If greater than the specified range, test the signal circuit and low reference circuit for a short to voltage or an open/high resistance. If the circuits test normal, replace the seat back heating element/temperature sensor.

• If less than the specified range, test for a short between the signal and low reference circuits. If the circuits test normal, replace the seat back heating element/temperature sensor.

5. Ignition OFF, connect the X1, X2, X4 harness connectors at the HSM.

6. Disconnect the harness connector at the seat back heating element/temperature sensor.

7. Ignition ON, test for 4.8-5.2 volts between the signal circuit terminal C and ground.

• If greater than the specified range, test the signal circuit for a short to voltage. If the circuit tests normal, replace the HSM.

• If less than the specified range, test the signal circuit for a short to voltage. If the circuit tests normal, replace the HSM.

8. If all circuits test normal, replace the HSM.

B2180 0A, B2180 0B, B2180 0C, B2180 0D, B2180 0E, B2180 04, or B2180 1F

1. Ignition OFF, disconnect the X1 harness connector at the HSM.

Important:
When measuring the resistance, the resistance values are based on the seat being at room temperature of 20°C (68°F).


2. Test for 6.0-14.3 ohms between the control circuit terminal 6 and the control circuit terminal 4.

• If greater than the specified value, test the control circuits for an open/high resistance. If the circuits test normal, replace the seat back heating element/temperature sensor.

• If less than the specified range, test for a short between the control circuits. If the circuits test normal, replace the seat back heating element/temperature sensor.

3. Ignition OFF, disconnect the X2, X4 harness connectors at the HSM.

4. Test for 3.3K-300K ohms between the signal circuit terminal 10 X4 and the low reference circuit terminal 7 X2.

• If greater than the specified range, test the signal circuit and low reference circuit for a short to voltage or an open/high resistance. If the circuits test normal, replace the seat back heating element/temperature sensor.

• If less than the specified range, test for a short between the signal and low reference circuits. If the circuits test normal, replace the seat back heating element/temperature sensor.

5. Ignition OFF, connect the X1, X2, X4 harness connectors at the HSM.

6. Disconnect the harness connector at the seat back heating element/temperature sensor.

7. Ignition ON, test for 4.8-5.2 volts between the signal circuit terminal C and ground.

• If greater than the specified range, test the signal circuit for a short to voltage. If the circuit tests normal, replace the HSM.

• If less than the specified range, test the signal circuit for a short to voltage. If the circuit tests normal, replace the HSM.

8. If all circuits test normal, replace the HSM.

Repair Instructions

Perform the Diagnostic Repair Verification Verification Tests after completing the diagnostic procedure.

* Driver or Passenger Seat Back Cushion Heater Replacement Driver or Passenger Seat Back Cushion Heater Replacement

* Control Module References Programming and Relearning for HSM replacement, setup, and programming

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