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Home >> Chevrolet >> 1999 >> Astro Van Cargo, AWD >> Repair and Diagnosis >> Body & Frame >> Door Locks >> Anti-Theft System >> Diagnostic Information and Procedures >> DTC B2957 Security System Sensor Data Circuit Low >> Test Description

Test Description

The numbers below refer to the step numbers on the diagnostic table. No information is missing.

2:   This step tests for a short to ground in CKT 1836.

3:   This step tests for the 5 volt reference in the Passlock module in order to determine if the module or the Passlock sensor need to be replaced.

TEST DESCRIPTION

Step Action Value(s) Yes No
1 Did you perform the VTD Diagnostic System Check? -- Go to Step 2 Go to Diagnostic System Check - Theft Deterrent 
2
  1. Turn the ignition switch OFF.
  2. Disconnect the Passlock module connector. Refer to Theft Deterrent Module Replacement  .
  3. Use a J 39200 digital multimeter (DMM) in order to measure the resistance from the Passlock/EVO module connector terminal B7 to ground.
Is the resistance within the specified value?
(OL) infinite Go to Step 3 Go to Step 6
3
  1. Reconnect the Passlock module.
  2. Connect a fused jumper between the Passlock module connector terminal B8 and terminal B3.
  3. Use a scan tool in order to read the Passlock code.
Does the Passlock code read open?
-- Go to Step 4 Go to Step 5
4
  1. Remove the jumper.
  2. Replace the Passlock sensor in the electronic column lock module assembly.
Is the repair complete?
-- Go to Step 7 --
5
  1. Remove the jumper.
  2. Replace the Passlock module. Refer to Theft Deterrent Module Replacement .
Is the repair complete?
-- Go to Step 7 --
6 Repair the short to ground in CKT 1836.
Is the repair complete?
-- Go to Diagnostic System Check - Theft Deterrent  --
7
  1. Reconnect all of the previously disconnected connectors and the components.
  2. Turn the ignition switch ON
  3. Connect the scan tool.
  4. Clear the DTCs.
  5. Perform one of the following Passlock reprogramming procedures:
-- Go to Diagnostic System Check - Theft Deterrent  --