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Home >> Chevrolet >> 2002 >> Blazer 4D Utility, 4WD, Part Time >> Repair and Diagnosis >> External Pages >> Different car >> Section 1336 (Door System, Mirror System & Window System) >> Diagnostic Information and Procedures >> Power Door Locks Inoperative - Key Cylinder Switches

Power Door Locks Inoperative - Key Cylinder Switches

WARNING: This page is about a different car, the 2004 Pontiac Vibe. However, it is still accessible from the selected car via links, so may be relevant.
Power Door Locks Inoperative - Key Cylinder Switches

Step Action Yes No
Schematic Reference: Door Lock/Indicator Schematics 
Connector End View Reference: Power Door Systems Connector End Views 
1 Did you review the power door system Description and Operation? Go to Step 2  Go to Diagnostic Starting Point - Doors 
2 Verify that the power door locks key cylinder switches inoperative fault is present.
Does the power door locks key cylinder switches system operate normally?
Go to Testing for Intermittent Conditions and Poor Connections in Wiring Systems Go to Step 3 
3 Does the power door locks system operate normally? Go to Step 4  Go to Symptoms - Doors 
4
  1. Turn OFF the ignition and remove the key.
  2. Lock the doors.
  3. Disconnect the appropriate door lock cylinder switch.
  4. Connect a 3 amp fused jumper wire between the driver door lock switch unlock signal circuit of the appropriate door lock cylinder switch and the ground circuit of the appropriate door lock cylinder switch.
Did the doors unlock?
Go to Step 7  Go to Step 5 
5 Test the door lock switch unlock signal circuit of the appropriate door lock cylinder switch for a short to ground or an open. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.
Did you find and correct the condition?
Go to Step 11  Go to Step 6 
6 Test the ground circuit of the appropriate door lock cylinder switch for an open. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.
Did you find and correct the condition?
Go to Step 11  Go to Step 8 
7 Inspect for poor connections at the harness connector of the appropriate door lock cylinder switch. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems.
Did you find and correct the condition?
Go to Step 11  Go to Step 9 
8 Inspect for poor connections at the harness connector of the multifunction alarm module. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems.
Did you find and correct the condition?
Go to Step 11  Go to Step 10 
9 Replace the appropriate door lock cylinder switch. Refer to Lock Cylinder Replacement - Door .
Did you complete the replacement?
Go to Step 11  -
10 Replace the multifunction alarm module. Refer to Multifunction Alarm Module Replacement in Instrument Panel, Gages and console.
Did you complete the replacement?
Go to Step 11  -
11 Operate the system in order to verify the repair.
Did you correct the condition?
System OK Go to Step 2