• Perform the Diagnostic System Check prior to using this diagnostic procedure:Diagnostic System Check - Vehicle
• Review the description of Strategy Based Diagnosis:Strategy Based Diagnosis
• An overview of each diagnostic category can be found here:Diagnostic Procedure Instructions

Symptom Byte Information:Symptom Byte List

The Driver and Passenger window switches are supplied with battery power and ground at all times. The switches have two normally open contacts that continuously provide ground to the window regulator motor control circuits. When a window switch has been activated the respective switch will move to the closed position and provide battery voltage to the appropriate window regulator motor control circuit. The voltage will then flow through the motor to ground via the other control circuit causing the window to perform up/down operation.

The front window switch circuits on this vehicle set codes that may display as rear window switch DTC’s.

• DTC B1954 Left Rear Window Switch applies to the S79D Front Side Door Window Control Switch - Driver control circuits.
• DTC B1955 Right Rear Window Switch applies to the S79P Front Side Door Window Control Switch - Passenger control circuits.

• Ignition/Vehicle=All power modes
• Voltage between 10–16 V

• 670=Short to Ground—For greater than 60 s
• 671=Short to Ground—For greater than 60 s

S79P Front Side Door Window Control Switch - Passenger=Internal Malfunction

S79P Front Side Door Window Control Switch - Passenger=Component Internal Malfunction

S79P Front Side Door Window Control Switch - Passenger—The right rear window motor may be inoperative or may be inoperative in the up function or the down function.

• A current DTC will clear when the diagnostic runs and passes.
• A history DTC will clear after 40 consecutive malfunction-free ignition cycles.

If set as a current DTC » Replace the component:S79P Front Side Door Window Control Switch - Passenger

Moveable Window Schematics

Master Electrical Component List

Power Windows Description and Operation

• Circuit Testing
• Connector Repairs
• Testing for Intermittent Conditions and Poor Connections
• Wiring Repairs

Control Module References

1. Ignition » On / Vehicle » In Service Mode
2. Operate the component:S79P Front Side Door Window Control Switch - Passenger»Pressed&Pulled

   Verify the component works as specified:

• M74P Front Side Door Window Regulator Motor-Passenger=Up
• M74P Front Side Door Window Regulator Motor-Passenger=Down
• If the component does not work as specified

  Refer to: Circuit/System Testing

• If the component works as specified
3. A fault that is not currently present may have been caused by a intermittent condition.

1. Ignition/Vehicle & All vehicle systems » Off
2. Disconnect the electrical connector:M74P Front Side Door Window Regulator Motor-Passenger
3. Connect a test lamp between the test points: Control circuit terminal 1 & Ground.
4. Ignition » On / Vehicle » In Service Mode
5. Operate the component:S79P Front Side Door Window Control Switch - Passenger»Pulled

   Verify the test lamp state:

   S79P Front Side Door Window Control Switch - Passenger»Not Used=Test lamp Off

   S79P Front Side Door Window Control Switch - Passenger»Pulled=Test lamp On

• If the test lamp is always OFF
1. Ignition OFF, remove the test lamp, disconnect the harness connector at the S79P Front Side Door Window Control Switch - Passenger
2. Test for infinite resistance between the signal 670 and ground.
• If less than infinite resistance, repair the short to ground on the circuit.
• If infinite resistance
3. Test for less than 2 Ω in the signal 670 end to end.
• If 2 Ω or greater, repair the open/high resistance in the circuit.
• If less than 2 Ω, replace the S79P Front Side Door Window Control Switch - Passenger
• If the test lamp is always ON
1. Ignition OFF, remove the test lamp, disconnect the harness connector at the S79P Front Side Door Window Control Switch - Passenger ignition ON.
2. Test for less than 1 V between the signal 670 and ground.
• If 1 V or greater, repair the short to voltage on the circuit.
• If less than 1 V, replace the S79P Front Side Door Window Control Switch - Passenger
• If the test lamp turns ON and OFF
6. Connect a test lamp between the test points: Control circuit terminal 2 & Ground.
7. Ignition » On / Vehicle » In Service Mode
8. Operate the component:S79P Front Side Door Window Control Switch - Passenger»Pressed

   Verify the test lamp state:

   S79P Front Side Door Window Control Switch - Passenger»Not Used=Test lamp Off

   S79P Front Side Door Window Control Switch - Passenger»Pressed=Test lamp On

• If the test lamp is always OFF
1. Ignition OFF, remove the test lamp, disconnect the harness connector at the S79P Front Side Door Window Control Switch - Passenger.
2. Test for infinite resistance between the signal 671 and ground.
• If less than infinite resistance, repair the short to ground on the circuit.
• If infinite resistance
3. Test for less than 2 Ω in the signal 671 end to end.
• If 2 Ω or greater, repair the open/high resistance in the circuit.
• If less than 2 Ω, replace the S79P Front Side Door Window Control Switch - Passenger.
• If the test lamp is always ON
1. Ignition OFF, remove the test lamp, disconnect the harness connector at the S79P Front Side Door Window Control Switch - Passenger, ignition ON.
2. Test for less than 1 V between the signal 671 and ground.
• If 1 V or greater, repair the short to voltage on the circuit.
• If less than 1 V, replace the S79P Front Side Door Window Control Switch - Passenger.
• If the test lamp turns ON and OFF
9. Test or replace the component:M74P Front Side Door Window Regulator Motor-Passenger.

1. Ignition/Vehicle » Off
2. Disconnect the electrical connector: M74P Front Side Door Window Regulator Motor-Passenger.
3. Connect a 25 A fused jumper wire between the test points:Control terminal 1&B+

Caution: Complete the testing as quickly as possible in order to prevent overheating and damaging the component.

4. Momentarily connect a jumper wire between the test points:Control terminal 2&Ground

Reverse the jumper wires 2 times between the terminals.

Verify the component works as specified: M74P Front Side Door Window Regulator Motor-Passenger=Up&Down

• If not the specified state

  Replace the component:M74P Front Side Door Window Regulator Motor-Passenger.

• If the specified state
5. All OK.

Perform the Diagnostic Repair Verification after completing the repair:Diagnostic Repair Verification

• Front Side Door Window Control Switch Replacement
• Front Side Door Window Regulator Replacement - Left Side
• Front Side Door Window Regulator Replacement - Right Side