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Tahoe / Yukon Service Manual

DTC B1710, B1711, or B1B4B

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 B1B4B Door Double Lock Actuator Lock Control 2 Symptom Byte Information: Symptom Byte List Diagnostic Fault Information

Circuit Short to Ground Open/High Resistance Short to Voltage Signal Performanc
Control — Terminal 6 @ A23LR Rear Side Door Latch - Left B1B4B 11 B1B4B 13 B1B4B 12 —
Control — Terminal 10 @ A23RR Rear Side Door Latch - Right B1B4B 11 B1B4B 13 B1B4B 12 —

Circuit/System Description For an overview of the component/system, refer to: Power Door Locks Description and Operation

Circuit Description
Control The output circuit is switched from ground to 12 V to activate the component.
Component Description
A23LR Rear Side Door Latch - Left The door locks are actuated by two bidirectional DC motors. The first motor locks/unlocks the door so that it can not be opened from outside the vehicle (but still from inside). The second motor dead locks the door so that it also can not be opened from the inside. In addition, all unlock buttons inside the vehicle become inoperative.
A23RR Rear Side Door Latch - Right The door locks are actuated by two bidirectional DC motors. The first motor locks/unlocks the door so
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Component Description
(but still from inside). The second motor dead locks the door so that it also can not be opened from the inside. In addition, all unlock buttons inside the vehicle become inoperative.
K9 Body Control Module The module controls various vehicle functions like lighting, central door locking, power windows, etc.

Conditions for Running the DTC Ignition » On / Vehicle » In Service Mode Conditions for Setting the DTC B1B4B 11 A23LR Rear Side Door Latch - Left or A23RR Rear Side Door Latch - Right — Control Circuit = Short to Ground B1B4B 12 A23LR Rear Side Door Latch - Left or A23RR Rear Side Door Latch - Right — Control Circuit = Short to Battery B1B4B 13 A23LR Rear Side Door Latch - Left or A23RR Rear Side Door Latch - Right — Control Circuit = Open/High Resistance Actions Taken When the DTC Sets Inoperative Conditions for Clearing the DTC A current DTC will clear when the diagnostic runs and passes. A history DTC will clear after 40 consecutive malfunction-free ignition cycles. Reference Information Schematic Reference Door Lock/Indicator Schematics Connector End View Reference Master Electrical Component List Electrical Information Reference Circuit Testing Connector Repairs Testing for Intermittent Conditions and Poor Connections Wiring Repairs Electrical Relay Replacement Scan Tool Reference Control Module References Circuit/System Verification

  1. Ignition » On / Vehicle » In Service Mode
  2. Operate the component: S13D Door Lock Switch - Driver » Lock Switch Verify the correct operation: Interior Door Handle @ Left Rear Door = Disabled Interior Door Handle @ Right Rear Door = Disabled ⇒ If the component does not work as specified Refer to: Circuit/System Testing ⇓ If the component works as specified
  3. Operate the component: S13D Door Lock Switch - Driver » Unlock Switch Verify the correct operation: Interior Door Handle @ Left Rear Door = Enabled Interior Door Handle @ Right Rear Door = Enabled ⇒ If the component does not work as specified Refer to: Circuit/System Testing ⇓ If the component works as specified
  4. All OK. Circuit/System Testing
  5. Ignition/Vehicle & All vehicle systems » Off
  6. Disconnect the electrical connector: A23RR Rear Side Door Latch - Right
  7. Connect a test lamp between the test points: Control circuit terminal 8 & Ground
  8. Ignition » On / Vehicle » In Service Mode
  9. Operate the component: S13D Door Lock Switch - Driver » Lock Switch & Unlock Switch Verify the test lamp state: Not Pressed = Test lamp Off Lock Switch » Pressed = Test lamp On Unlock Switch » Pressed = Test lamp On ⇒ If not the specified state 5.1. Ignition/Vehicle » Off & Remove » Test lamp 5.2. Disconnect the electrical connector: A23LR Rear Side Door Latch - Left 5.3. Ignition » On / Vehicle » In Service Mode 5.4. Test for less than 1 V between the test points: Control circuit terminal 10 @ A23RR Door Latch Assembly - Right Rear & Ground ⇒ If 1 V or greater » Repair the short to voltage on the circuit. ⇓ If less than 1 V 5.5. Ignition/Vehicle » Off 5.6. Test for infinite resistance between the test points: Control circuit terminal 10 @ A23RR  Door Latch Assembly - Right Rear & Ground ⇒ If less than infinite resistance » Repair the short to ground on the circuit. ⇓ If infinite resistance 5.7. Test for less than 2 Ω between the test points: Control circuit terminal 10 @ A23RR Door Latch Assembly - Right Rear & Control circuit terminal 6 @ A23LR Rear Side Door Latch - Left ⇒ If 2 Ω or greater » Repair the open/high resistance in the circuit. ⇒ If less than 2 Ω » Replace the component: A23LR Rear Side Door Latch - Left ⇓ If the specified state
  10. Test or replace the component: A23RR Rear Side Door Latch - Right Repair Instructions Perform the Diagnostic Repair Verification after completing the repair: Diagnostic Repair Verification Rear Side Door Latch Replacement For control module replacement, programming, and setup refer to: Control Module References