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HOMESERVICE MANUALSPONTIAC2007WAVE LT, 4D HATCHBACK, STANDARD, Y4M/MLMREPAIR AND DIAGNOSIS (SINGLE PAGE)BODY & FRAMEDOOR LOCKSIMMOBILIZER SYSTEMDIAGNOSTIC INFORMATION AND PROCEDURESDTC P1626TEST DESCRIPTION
2007 Pontiac Wave LT, 4D Hatchback, Standard, Y4M/MLM

Test Description

2007 Pontiac Wave LT, 4D Hatchback, Standard, Y4M/MLMSECTION Test Description

The numbers below refer to the step numbers in the diagnostic table.

  1. 3:  This step tests for ignition voltage to the theft deterrent module. The theft deterrent module cannot communicate with the ECM if there is no ignition positive voltage.
  2. 4:  This step tests for a good ground to the theft deterrent module. The theft deterrent module cannot communicate with the ECM if there is no ground circuit.
DTC P1626

Step Action Yes No
Schematic Reference: Theft Deterrent System Schematics (Notchback) or Theft Deterrent System Schematics (Hatchback)
Connector End View Reference: Theft Deterrent System Connector End Views (Notchback) or Theft Deterrent System Connector End Views (Hatchback)
1 Did you perform the Diagnostic System Check - Vehicle? Go to Step 2  Go to Diagnostic System Check - Vehicle
2 Is DTC P1626 present? Go to Step 3  Go to Diagnostic System Check - Vehicle
3 
  1. Turn OFF the ignition.
  2. Disconnect the theft deterrent module electrical connector.
  3. Turn the ignition ON, with the engine OFF.
  4. Connect a test lamp to the ignition 1 voltage circuit at the connector and ground.
Does the test lamp illuminate?		 Go to Step 4  Go to Step 6 
4  Connect a test lamp to B+ and the ground circuit of the theft deterrent module.
Did the test lamp illuminate?		 Go to Step 7  Go to Step 5 
5 Repair the open or the poor connection in the theft deterrent module ground circuit. Refer to Testing for Intermittent Conditions and Poor Connections and Wiring Repairs .
Did you find and correct a condition?		 Go to Step 10  Go to Step 7 
6 Repair the open or the poor connection ignition 1 voltage circuit of the theft deterrent module. Refer to Testing for Intermittent Conditions and Poor Connections and Wiring Repairs .
Did you find and correct a condition?		 Go to Step 10  Go to Step 7 
7 Inspect for a poor electrical connection at the theft deterrent control module. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs .
Did you find and correct a condition?		 Go to Step 10  Go to Step 8 
8
  1. Use the scan tool in order to clear the DTCs.
  2. Turn OFF the ignition for 30 seconds.
  3. Attempt to start the engine.
  4. Use the scan tool and check for DTCs.
Did the engine start and run with no DTC P1626 set?		 Go to Diagnostic Aids Go to Step 9 
9 Replace the theft deterrent control module. Refer to Theft Deterrent Module Replacement .
Did you complete the replacement?		 Go to Step 10  -
10
  1. Use the scan tool in order to clear the DTCs.
  2. Turn OFF the ignition for 30 seconds.
  3. Attempt to start and run the engine.
  4. Use the scan tool and check for DTCs.
Did DTC P1626 set?		 Go to Step 2  System OK
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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.