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Home >> GMC >> 2005 >> Jimmy Part Time, Automatic >> Repair and Diagnosis >> Accessories & Equipment >> Anti-Theft Systems >> Keyless Entry System >> Diagnostic Information and Procedures >> Keyless Entry System Inoperative >> Test Description
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Test Description

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

  1. 14:  A DMM must be used in this step. A test lamp may give incorrect results. Testing for B+ supply from the body control module (BCM).
  2. 15:  An illuminated test lamp at step 16 reveals a short to voltage in the serial data circuit.
Keyless Entry System Inoperative

Step Action Values Yes No
1 Did you perform the Diagnostic System Check - Vehicle? - Go to Step 2  Go to Diagnostic System Check - Vehicle in Vehicle DTC Information
2 Press each button of the transmitter one at a time.
Does the system operate normally?		 - Go to Testing for Intermittent Conditions and Poor Connections in Wiring Systems Go to Step 3 
3 Lock and unlock the door locks using the controls inside the vehicle.
Do the locks operate properly?		 - Go to Step 4  Go to Diagnostic System Check - Vehicle in Vehicle DTC Information
4
IMPORTANT: Inspect that the keyless entry transmitter is the correct model for the vehicle remote system. A wrong model transmitter may pass this test, but will not activate the vehicle remote system.
  1. Turn ON the J 43241  Keyless Entry Tester. See Special Tools .
  2. Place the transmitter on the J 43241  test pad. See Special Tools .
  3. Press each button of the transmitter one at a time.
Does a tone sound and the green light illuminate on the J 43241  after each button is pressed?. See Special Tools .		 - Go to Step 9  Go to Step 5 
5 Do any of the buttons on the transmitter sound the tone and illuminate the green light when pressed? - Go to Step 8  Go to Step 6 
6 Replace the transmitter battery. Refer to Transmitter Battery Replacement .
Did you complete the replacement?		 - Go to Step 7  -
7
  1. Turn ON the J 43241  . See Special Tools .
  2. Place the transmitter on the J 43241  test pad. See Special Tools .
  3. Press each button of the transmitter one at a time.
Does a tone sound and the green light illuminate on the J 43241  after each button is pressed?. See Special Tools .		 - Go to Step 9  Go to Step 8 
8 Replace the transmitter.
Did you complete the replacement?		 - Go to Step 11  -
9 Press the PANIC button on the transmitter.
Does the PANIC function operate normally?		 - Go to Step 10  Go to Step 11 
10 Operate the transmitter within range of the vehicle.
Do all of the keyless entry functions operate normally?		 - Go to Step 24  Go to Step 11 
11
IMPORTANT: All transmitters which are to be recognized by the remote control door lock receiver must be programmed in a single programming sequence. If the system is placed in program mode it will erase all previously programmed transmitters upon the receipt of the programming signal from the first transmitter.
Perform the programming procedure. Refer to Transmitter Programming .Did you hear the body control module (BCM) chime to confirm that the transmitter programming has been completed?		 - Go to Step 24  Go to Step 12 
12
  1. Turn OFF the ignition.
  2. Disconnect the remote control door lock receiver (RCDLR).
  3. Connect a test lamp between the battery positive voltage circuit of the RCDLR and a good ground.
Does the test lamp illuminate?		 - Go to Step 13  Go to Step 19 
13 Connect a test lamp between the battery positive voltage circuit of the RCDLR and the RCDLR ground circuit.
Does the test lamp illuminate?		 - Go to Step 14  Go to Step 20 
14 
  1. Disconnect the test lamp.
  2. Turn ON the ignition, with the engine OFF.
  3. With a DMM, measure the voltage between the keyless entry serial data circuit and the RCDLR ground circuit.
Does the DMM indicate the specified value?		 B+ Go to Step 15  Go to Step 16 
15 
  1. Turn ON the ignition, with the engine OFF.
  2. Connect a test lamp between the keyless entry serial data circuit and the RCDLR ground circuit.
Does the test lamp illuminate?		 - Go to Step 21  Go to Step 17 
16 Test the keyless entry serial data circuit for an open, high resistance, or short to ground. Refer to Circuit Testing andTesting for Intermittent Conditions and Poor Connections in Wiring Systems.
Did you find and correct the condition?		 - Go to Step 24  Go to Step 18 
17 Inspect for poor connections at the harness connector of the RCDLR. Refer to Testing for Intermittent Conditions and Poor Connections andConnector Repairs in Wiring Systems.
Did you find and correct the condition?		 - Go to Step 24  Go to Step 22 
18 Inspect for poor connections at the harness connector of the BCM. 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 24  Go to Step 23 
19 Repair the open, high resistance, or short to ground in the battery positive voltage circuit of the RCDLR. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.
Did you complete the repair?		 - Go to Step 24  -
20 Repair the open or high resistance in the RCDLR ground circuit. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.
Did you complete the repair?		 - Go to Step 24  -
21 Repair the short to voltage in the keyless entry serial data circuit. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.
Did you complete the repair?		 - Go to Step 24  -
22 Replace the RCDLR. Refer to Control Module References in Computer/Integrating Systems for replacement, setup, and programming.
Did you complete the replacement?		 - Go to Step 24  -
23 Replace the BCM. Refer to Control Module References in Computer/Integrating Systems for replacement, setup, and programming.
Did you complete the replacement?		 - Go to Step 24  -
24 Operate the system in order to verify the repair.
Did you correct the condition?		 - System OK Go to Step 3 
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