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B1E41






B1E41 - 3rd Row Seat Left Backrest Control Circuit Performance






For a complete wiring diagram, refer to.

When Monitored: Whenever the Backrest motor is activated.

Set Condition: If the folding seat module does not detect seat motor rotation from the motor position sensor after a switch activation input.






Test Step 1 - Check For Related Diagnostic Trouble Codes

Turn the ignition ON.

With the scan tool, read DTCs.

Does the scan tool display seat position sensor DTC?

Yes

Diagnose and repair the other DTCs first. Refer to => Non - DTC Based Diagnostics.

No

Go to Test Step 2 => [ Test
Step 2 - Test for Intermittent Condition ]

Test Step 2 - Test for Intermittent Condition

Turn the ignition ON.

With the scan tool, erase all DTCs.

Activate the seat switch of the affected positions three times.

With the scan tool, read DTCs.

Does the scan tool display this DTC as active?

Yes

Go to Test Step 3 => [ Test
Step 3 - Check the Left Seat Back Position Sensor Supply Circuit Voltage ]

No

The condition that caused this symptom is currently not present. Check for an intermittent condition by inspecting the related wiring harness for chafed, pierced, pinched, and partially broken wires. Also, inspect the related connectors for broken, bent, pushed out, spread, corroded, or contaminated terminals. Repair as necessary.

Perform Power Folding Seat System Verification Test. Refer to => Non - DTC Based Diagnostics. Power Folding Seat System Verification Test

Test Step 3 - Check the Left Seat Back Position Sensor Supply Circuit Voltage






Turn the ignition OFF.

Disconnect the left power rear folding seat back motor harness connector.

Connect voltmeter between the left seat back position sensor supply circuit and the left seat back position sensor return circuit at the seat motor harness connector.

With the folding seat switch select the left seat.

Depress the stow position switch.

Is the voltage 10.0 volts?

Yes

Go to Test Step 4 => [ Test
Step 4 - Check the Left Seat Back Forward/Rearward Driver Circuit
Voltage ]

No

Go to Test Step 5 => [ Test
Step 5 - Check the Left Seat Back Position Sensor Supply Circuit for
an Open ]

Test Step 4 - Check the Left Seat Back Forward/Rearward Driver Circuit Voltage






Using a 12 volt test light connect one lead to the left seat back motor forward driver circuit and the other lead to left seat back motor rearward driver circuit at the seat motor harness connector.

With the left seat selected at the folding seat switch, depress any folding seat button twice then alternate to a different button and depress it twice.

Light should flash On with second button press.

Does the test light flash On momentarily?

Yes

Remove the seat back motor assembly and inspect seat recliner mechanism for any binding or a seized condition. If OK, replace the motor assembly.

Perform Power Folding Seat System Verification Test. Refer to => Non - DTC Based Diagnostics. Power Folding Seat System Verification Test

No

Go to Test Step 7 => [ Test
Step 7 - Check the Left Seat Back Motor Forward Driver Circuit for
an Open ]

Test Step 5 - Check the Left Seat Back Position Sensor Supply Circuit for an Open






Disconnect the folding seat module C4 harness connector.

Measure the resistance of the left seat back position sensor supply circuit between the seat motor harness connector and the folding seat module C4 harness connector.

Is the resistance below 3.0 ohms?

Yes

Go to Test Step 6 => [ Test
Step 6 - Check the Left Seat Back Position Sensor Return Circuit for
an Open ]

No

Repair the left seat back position sensor supply circuit for an open.

Perform Power Folding Seat System Verification Test. Refer to => Non - DTC Based Diagnostics. Power Folding Seat System Verification Test

Test Step 6 - Check the Left Seat Back Position Sensor Return Circuit for an Open






Measure the resistance of the left seat back position sensor return circuit between the seat motor harness connector and the folding seat module C4 harness connector.

Is the resistance below 3.0 ohms?

Yes

Replace the folding seat module.

Perform Power Folding Seat System Verification Test. Refer to => Non - DTC Based Diagnostics. Power Folding Seat System Verification Test

No

Repair the left seat back position sensor return circuit for an open.

Perform Power Folding Seat System Verification Test. Refer to => Non - DTC Based Diagnostics. Power Folding Seat System Verification Test

Test Step 7 - Check the Left Seat Back Motor Forward Driver Circuit for an Open






Disconnect the folding seat module C4 harness connector.

Measure the resistance of the left seat back motor forward driver circuit between the seat motor harness connector to the folding seat module C4 harness connector.

Is the resistance below 3.0 ohms?

Yes

Go to Test Step 8 => [ Test
Step 8 - Check the Left Seat Back Motor Rearward Driver Circuit for
an Open ]

No

Repair the left seat back motor forward driver circuit for an open.

Perform Power Folding Seat System Verification Test. Refer to => Non - DTC Based Diagnostics. Power Folding Seat System Verification Test

Test Step 8 - Check the Left Seat Back Motor Rearward Driver Circuit for an Open






Measure the resistance of the left seat back motor rearward driver circuit between the seat motor harness connector and the folding seat module C4 harness connector.

Is the resistance below 3.0 ohms?

Yes

Replace the folding seat module.

Perform Power Folding Seat System Verification Test. Refer to => Non - DTC Based Diagnostics. Power Folding Seat System Verification Test

No

Repair the left seat back motor rearward driver circuit for an open.

Perform Power Folding Seat System Verification Test. Refer to => Non - DTC Based Diagnostics. Power Folding Seat System Verification Test