LEMON Manuals: Even more car manuals for everyone: 1960-2025
Home >> Suzuki >> 2004 >> Swift + >> Repair and Diagnosis >> External Pages >> Different car >> Section 12 (Theft Deterrent System) >> Diagnostic Information and Procedures >> DTC P1626 >> Test Description
April 5, 2026: LEMON Manuals is launched! Read the announcement.

Test Description

WARNING: This page is about a different car, the 2005 Suzuki Swift +, 2005 Pontiac Wave, and 2005 Chevrolet Aveo. However, it is still accessible from the selected car via links, so may be relevant.

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 
Connector End View Reference: Theft Deterrent System Connector End Views 
1 Did you perform the Diagnostic System Check - Theft Deterrent? Go to Step 2  Go to Diagnostic System Check - Theft Deterrent 
2 Is DTC P1626 present? Go to Step 3  Go to Symptoms - Data Link Communications
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 in Wiring Systems.
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 in Wiring Systems.
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 in Wiring Systems.
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 Control 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
scientia non olet · About LEMON Manuals