Skip to content
Tahoe / Yukon Service Manual

DTC B1953

Diagnostic Instructions 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 DTC Descriptor DTC B1953 Passenger Window Switch Symptom Byte Information: Symptom Byte List Diagnostic Fault Information

Circuit Number Circuit Function Short to Ground Open/High Resistance Short to Voltage Signal Performan
1184 Signal B1953 11 1 1 —
5295 Signal B1953 11 1 1 —
2765 Signal B1953 11 1 1 —
1. M74P Front Side Door Window Regulator Motor-Passenger= Inoperative

Circuit/System Description The window motors supply 12V signal circuits to their respective window switches, when a window switch has been activated, a switch closes providing a ground to the appropriate signal circuit causing the voltage to drop to 0V. The window motor will detect the voltage drop in the signal circuit and will command the window to move in the desired direction. Conditions for Running the DTC Ignition/Vehicle = All power modes Voltage between 10–16 V Conditions for Setting the DTC B1953 11 1184= Short to Ground — For greater than 60 s 5295= Short to Ground — For greater than 60 s 2765= Short to Ground — For greater than 60 s B1953 49 S79P Front Side Door Window Switch - Passenger = Internal Malfunction B1953 96 S79P Front Side Door Window Switch - Passenger = Component Internal Malfunction Actions Taken When the DTC Sets S79P Front Side Door Window Switch - Passenger — The passenger window motor may be inoperative or may be inoperative in the up function, the down function or the express functions from the passenger window switch. Conditions for Clearing the DTC B1953 11 A current DTC will clear when the diagnostic runs and passes. A history DTC will clear after 40 consecutive malfunction-free ignition cycles. B1953 49, B1953 96 If set as a current DTC » Replace the component: S79P Front Side Door Window Switch - Passenger Reference Information Schematic Reference Moveable Window Schematics Connector End View Reference Master Electrical Component List Description and Operation Power Windows Description and Operation Electrical Information Reference Circuit Testing Connector Repairs Testing for Intermittent Conditions and Poor Connections Wiring Repairs Scan Tool Reference Control Module References Circuit/System Verification

  1. Vehicle Power Mode » Run/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 = Express Up M74P Front Side Door Window Regulator Motor-Passenger = Down M74P Front Side Door Window Regulator Motor-Passenger = Express Down ⇒ If the component does not work as specified Refer to: Circuit/System Testing ⇓ If the component works as specified
  3. All OK. Circuit/System Testing
  4. Vehicle Power Mode » Off.
  5. Disconnect the electrical connector: M74P Front Side Door Window Regulator Motor-Passenger.
  6. Connect a test lamp between the test points: Signal circuit terminal 3 & B+.
  7. Vehicle Power Mode » Run/Service Mode.
  8. Operate the component: S79P Front Side Door Window Switch - Passenger » Pulled. Verify the test lamp state: S79P Front Side Door Window Switch - Passenger » Not Used = Test lamp Off S79P Front Side Door Window Switch - Passenger » Pulled = Test lamp On ⇒ If the test lamp is always OFF 5.1. Vehicle Power Mode » Off. 5.2. Remove the test lamp, disconnect the X1 harness connector at the S79P Front Side Door Window Switch - Passenger. 5.3. Test for less than 2 Ω in the circuit 1184 end to end. ⇒ If 2 Ω or greater, repair the open/high resistance in the circuit. ⇓ If less than 2 Ω. 5.4. Vehicle Power Mode » Run/Service Mode. 5.5. Test for less than 1 V between the circuit 1184 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 Switch - Passenger. ⇒ If the test lamp is always ON 5.1. Vehicle Power Mode » Off. 5.2. Remove the test lamp, disconnect the X1 harness connector at the S79P Front Side Door Window Switch - Passenger. 5.3. Test for infinite resistance between the circuit 1184 and ground. ⇒ If less than infinite resistance, repair the short to ground on the circuit. ⇒ If infinite resistance, replace the S79P Front Side Door Window Switch - Passenger. ⇓ If the test lamp turns ON and OFF
  9. Connect a test lamp between the test points: Signal circuit terminal 7 & B+.
  10. Vehicle Power Mode » Run/Service Mode.
  11. Operate the component: S79P Front Side Door Window Switch - Passenger » Pressed. Verify the test lamp state: S79P Front Side Door Window Switch - Passenger » Not Used = Test lamp Off S79P Front Side Door Window Switch - Passenger » Pressed = Test lamp On ⇒ If the test lamp is always OFF 8.1. Vehicle Power Mode » Off. 8.2. Remove the test lamp, disconnect the X1 harness connector at the S79P Front Side Door Window Switch - Passenger. 8.3. Test for less than 2 Ω in the circuit 5295 end to end. ⇒ If 2 Ω or greater, repair the open/high resistance in the circuit. 8.4. Vehicle Power Mode » Run/Service Mode. 8.5. Test for less than 1 V between the circuit 5295 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 Switch - Passenger. ⇒ If the test lamp is always ON 8.1. Vehicle Power Mode » Off. 8.2. Remove the test lamp, disconnect the X1 harness connector at the S79P Front Side Door Window Switch - Passenger. 8.3. Test for infinite resistance between the circuit 5295 and ground. ⇒ If less than infinite resistance, repair the short to ground on the circuit. ⇒ If infinite resistance, replace the S79P Front Side Door Window Switch - Passenger. ⇓ If the test lamp turns ON and OFF
  12. Connect a test lamp between the test points: Signal circuit terminal 5 & B+.
  13. Vehicle Power Mode » Run/Service Mode.
  14. Operate the component: S79P Front Side Door Window Switch - Passenger » Pressed & Pulled Verify the test lamp state: S79P Front Side Door Window Switch - Passenger » Not Used = Test lamp Off S79P Front Side Door Window Switch - Passenger » Pressed = Test lamp On S79P Front Side Door Window Switch - Passenger » Pulled = Test lamp On ⇒ If the test lamp is always OFF 11.1. Vehicle Power Mode » Off. 11.2. Remove the test lamp, disconnect the X2 harness connector at the S79P Front Side Door Window Switch - Passenger. 11.3. Test for less than 2 Ω in the circuit 2675 end to end. ⇒ If 2 Ω or greater, repair the open/high resistance in the circuit. ⇓ If less than 2 Ω. 11.4. Vehicle Power Mode » Run/Service Mode. 11.5. Test for less than 1 V between the circuit 2675 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 Switch - Passenger. ⇒ If the test lamp is always ON 11.1. Vehicle Power Mode » Off. 11.2. Remove the test lamp, disconnect the X2 harness connector at the S79P Front Side Door Window Switch - Passenger. 11.3. Test for infinite resistance between the circuit 2675 and ground. ⇒ If less than infinite resistance, repair the short to ground on the circuit. ⇒ If infinite resistance, replace the S79P Front Side Door Window Switch - Passenger. ⇓ If the test lamp turns ON and OFF
  15. Test or replace the component: M74P Front Side Door Window Regulator Motor-Passenger Repair Instructions Perform the Diagnostic Repair Verification after completing the repair: Diagnostic Repair Verification Front Side Door Window Regulator Motor Replacement Front Side Door Window Switch Replacement - Right Side