Test B: Keyless Entry System Inoperative

NOTE: Some symptom testing requires using special tool, Keyless Entry Tester (J43241).

NOTE: For component locations, see COMPONENT LOCATIONS . For wiring circuit identification, see WIRING DIAGRAMS .

If remote keyless entry system diagnostic system check has been performed, go to next step. If remote keyless entry system diagnostic system check has not been performed, perform REMOTE KEYLESS ENTRY SYSTEM DIAGNOSTIC SYSTEM CHECK under SELF-DIAGNOSTIC SYSTEM.
Press each button of transmitter one at a time. If system operated normally, problem is intermittent. See DIAGNOSING INTERMITTENTS . If system did not operate normally, go to next step.
Close all vehicle doors. Press LOCK and UNLOCK buttons on both front door lock switches. If all doors lock and unlock with door switches, go to next step. If all doors do not lock and unlock with door switches, see appropriate POWER DOOR LOCKS article.

NOTE: Inspect keyless entry transmitter to ensure it is correct model for this vehicle. A wrong model transmitter may pass this test, but will not activate vehicle remote system.

Turn on Keyless Entry Tester (J43241). Place transmitter on keyless entry tester pad. Press each button of transmitter one at a time. If a tone does not sound or Green light does not illuminate after each button is pressed, go to next step. If a tone sounds and Green light illuminates after each button is pressed, go to step 9 .
If any button sounds tone and illuminates Green light, go to step 8 . If no buttons sound tone or illuminate Green light, replace transmitter. Go to next step.
Replace battery in transmitter. Synchronize transmitter. See TRANSMITTER SYNCHRONIZATION under PROGRAMMING. Go to next step.
Turn on Keyless Entry Tester (J 43241). Place transmitter on (J 43241) test pad. Press each button of transmitter one at a time. If a tone does not sound or Green light does not illuminate after each button is pressed, go to next step. If a tone sounds and Green light illuminates after each button is pressed, go to step 9 .
Replace transmitter. Program new transmitter. See TRANSMITTER PROGRAMMING under PROGRAMMING. Go to step 12 .
Press panic button on transmitter. If panic function operates normally, go to next step. If panic function did not operate normally, repair as necessary, after repair, go to step 12 .
Perform synchronization procedure. See TRANSMITTER SYNCHRONIZATION under PROGRAMMING. If locks cycle to lock then unlock, go to next step. If locks do not cycle to lock then unlock, go to step 12
Operate transmitter within range of vehicle. If all Remote Keyless Entry functions operate normally, go to step 25 . If all Remote Keyless Entry functions did not operate normally, go to step 12 .

NOTE: All transmitters which are to be recognized by Remote Control Door Lock Receiver (RCDLR) must be programmed in a single programming sequence. If system is placed in program mode it will erase all previously programmed transmitters upon receipt of programming signal from first transmitter. Perform programming procedure. See TRANSMITTER PROGRAMMING under PROGRAMMING.

If locks cycle to lock then unlock, go to step 25 . If locks do not cycle to lock then unlock, go to next step.
Turn off ignition. Disconnect RCDLR harness connector. Connect a test light between battery positive voltage circuit at RCDLR 4 pin harness connector terminal No. 1 (Orange wire) and ground. See Fig 1 . If test light illuminated, go to next step. If test light did not illuminate, go to step 21 .
Connect a test light between battery positive voltage circuit terminal No. 1 (Orange wire) and ground circuit at RCDLR harness connector terminal No. 4 (Black wire). See Fig 1 . If test light illuminated, go to next step. If test light did not illuminate, go to step 22 .
Disconnect test light. Turn on ignition, with engine off. With a DVOM measure voltage between keyless entry serial data circuit at RCDLR 4 pin harness connector terminal No. 2 (Orange wire) and ground. If battery voltage is present, go to next step. If battery voltage is not present, go to step 18 .
Turn on ignition, with engine off. Connect a test light between keyless entry serial data circuit RCDLR 4 pin harness connector terminal No. 2 (Orange wire) and ground. See Fig 1 . If test light is illuminated, go to next step. If test light did not illuminate, go to step 19 .
Test keyless entry serial data circuit for a short to voltage. If a problem is found, repair as necessary. After repair, go to step 25 . If no problem was found, go to step 20 .
Test keyless entry serial data circuit for an open, high resistance, or short to ground. If a problem is found, repair as necessary. After repair, go to step 25 . If no problem was found, go to step 20 .
Inspect for poor connections at RCDLR harness connector. If a problem is found, repair as necessary. After repair, go to step 25 . If no problem was found, go to step 23 .
Inspect for poor connections at Body Control Module (BCM) harness connector. If a problem is found, repair as necessary. After repair, go to step 25 . If no problem was found, go to step 24 .
Repair open, high resistance, or short to ground in RCDLR battery positive voltage circuit. Repair as necessary. After repair, go to step 25 .
Repair open or high resistance in RCDLR ground circuit. Repair as necessary. After repair, go to step 25 .
Replace RCDLR. See REMOTE CONTROL DOOR LOCK RECEIVER under REMOVAL & INSTALLATION. Program transmitters. See TRANSMITTER PROGRAMMING under PROGRAMMING. If system does not function properly, go to next step. If system functions properly, go to step 12 .
Replace BCM and perform programming procedure. See BODY CONTROL MODULES - ASTRO & SAFARI article. After repairs, go to next step.
Operate system in order to verify repair is completed. If operation is normal, system is okay. If operation is not normal, go to step 3 .

Fig 1: Identifying Remote Control Door Lock Receiver Blue 4-Pin Harness Connector Terminals

Courtesy of GENERAL MOTORS CORP.