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Home >> Chevrolet >> 2020 >> Express 2500 LS, 6.0L Eng VIN G >> Repair and Diagnosis >> External Pages >> Different car >> Section 19 (Vehicle Access System) >> Diagnostic Information and Procedures >> DTC B3125, B3130, or B3135 >> Circuit/System Verification

Circuit/System Verification

WARNING: This page is about a different car, the 2019 GMC Savana 3500, 2019 GMC Savana 2500, 2019 Chevrolet Express 3500, and 2019 Chevrolet Express 2500. However, it is still accessible from the selected car via links, so may be relevant.
  1. Ignition ON.
  2. Verify the A23 Door Latch Assembly listed below performs the LOCK and UNLOCK functions when using the S13D Door Lock Switch-Driver.
    • A23D Door Latch Assembly-Driver
    • A23P Door Latch Assembly-Passenger
    • M14RR Door Lock Actuator-Right Rear
    • M13 Door Latch Assembly-Rear Cargo
    • If the A23D Door Latch Assembly-Driver UNLOCK function does not work 

      Refer to Circuit/System Testing - Test 1

    • If the A23P Door Latch Assembly-Passenger, the M14RR Door Lock Actuator-Right Rear and M13 Door Latch Assembly-Rear Cargo UNLOCK function does not work 

      Refer to Circuit/System Testing - Test 2

    • If the A23D Door Latch Assembly-Driver, the A23P Door Latch Assembly-Passenger, the M14RR Door Lock Actuator-Right Rear and M13 Door Latch Assembly-Rear Cargo LOCK function does not work 

      Refer to Circuit/System Testing - Test 3

    • Go to next step: If the LOCK and UNLOCK function works 
  3. All OK.
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