Keyless Entry System - Remote Cadillac Escalade GMT400

DESCRIPTION & OPERATION (STANDARD KEYLESS ENTRY SYSTEM)

Note. This information does NOT apply to the Sierra and Silverado pickups.

STANDARD KEYLESS ENTRY SYSTEM

The keyless entry system operates by means of remote control. Use the transmitter in order to lock and unlock the vehicle doors. Use the transmitter in order to release the endgate or the tailgate window on the utility models.

The remote control door lock transmitters are supplied in pairs with each vehicle. The remote control door lock transmitters are hand-held and attached to a key ring. he transmitter for pickup models has two buttons in order to control the operation of the system. Whenever a button on the transmitter is pressed, the transmitter sends a coded Ultra-High Frequency (UHF) radio signal to the receiver.

The transmitter must be within 30 feet (9 meters) of the vehicle in order for the receiver to detect the coded signal. The keyless entry system has no effect on the normal operation of the power door locks. The keyless entry system has no effect on the endgate or the liftgate window release.

Each receiver is capable of recognizing four transmitters. Replacement transmitters may be obtained, but must be matched to the specific receiver. The transmitter is powered by a 3-volt battery, and is water resistant.

Unlocking

Note. Pickup trucks use a transmitter the does not have the REAR 2X push button on the face of the transmitter. (Scheme 23)and (Scheme 24).

Press the UNLOCK button on the transmitter once to unlock the driver's side door. Press the UNLOCK button on the transmitter twice within a half a second, and no later than three seconds time to unlock the remaining doors. This includes the liftgate on the utility vehicles which are equipped with this feature.

Scheme 23

Scheme 24

Locking

Press the LOCK button on the transmitter to lock all of the vehicles doors at once. Press the LOCK button a second time to verify that the doors are locked. A horn will sound to verify that the doors are locked.

Endgate/Liftgate Window Release

Press the REAR 2X button on the transmitter twice, within five seconds, to unlatch the liftgate window. Set the vehicle in Park or Neutral to operate the transmitter.

Remote Control Door Lock Receiver

The remote control door lock receiver is supplied battery voltage at all times, from the PWR ACCY circuit breaker in the instrument panel fuse block through CKT 540 (ORN) to cavity E and also cavity F, if equipped with cargo doors. If equipped with a liftgate, cavity F is powered from CIG LTR Fuse No. 13 through CKT 640 (ORN). See WIRING DIAGRAMS . The remote control door lock receiver is supplied KEY ON power from the GAUGES Fuse No. 4 in the instrument panel fuse block through CKT 39 (PNK) to cavity J. The remote control door lock receiver is supplied ground from G202 through CKT 150 (BLK) to cavity N.

Driver Door Unlock

When the unlock button on the transmitter is depressed once, the remote control door lock receiver sends a voltage signal through CKT 694 (TAN) to the left front door lock motor. See WIRING DIAGRAMS . Since CKT 295 (GRY) grounds through the door lock relay to CKT 150 (BLK) to G202, the drivers door unlocks.

Passenger & Cargo Door Unlock

When the unlock button on the transmitter is depressed twice, the remote control door lock receiver unlocks the drivers door, and also sends a voltage signal through CKT 194 (WHT) to the door lock relay. See WIRING DIAGRAMS . This energizes the door unlock coil and voltage is sent through CKT 294 (TAN) to the right front, right rear and left rear door lock motors and to the remote control door lock receiver cavity H. The remote control door lock receiver then sends a voltage signal through CKT 56 (BLK/WHT) to the cargo door lock motor. Since CKT 295 (GRY) grounds through the door lock relay to CKT 150 (BLK) to G202, the passenger and cargo door lock motors unlock.

Liftgate Unlock

When the REAR 2X unlock button is depressed twice, the remote control door lock receiver sends a voltage signal through CKT 1576 (BLK) to the liftgate release motor. See WIRING DIAGRAMS . Since CKT 1737 (YEL) grounds through the Park/Neutral Position Switch to CKT 150 (BLK) to G105, the liftgate is released. The vehicle must be in Park or Neutral for the liftgate to release.

Cargo Door Unlock

When the rear unlock button is depressed twice, the remote control door lock receiver sends a voltage signal through CKT 56 (BLK/WHT) to the cargo door lock motor. See WIRING DIAGRAMS . Since CKT 295 (GRY) grounds through the door lock relay to CKT 150 (BLK) to G202, the cargo door lock motor unlocks.

Driver, Passenger & Cargo Doors Lock

When the lock button on the transmitter is depressed, the remote control door lock receiver sends a voltage signal through CKT 195 (LT BLU) to the door lock relay. See WIRING DIAGRAMS . This energizes the door lock coil and voltage is sent through CT 295 (GRY) to the left front, right front, right rear, left rear and cargo door lock motors.

Since CKT 694 (TAN) internally grounds the left front door lock motor in the remote control door lock receiver, CKT 294 (TAN) grounds the right front, right rear and left rear door lock motors through the door lock relay to CKT 150 (BLK) to G202, and CKT 56 (BLK/WHT) grounds the cargo door lock motor through the remote control door lock receiver back to CKT 294 (TAN), all doors lock.

Door Lock Verification

When the door lock button is depressed, all doors will lock, and also the remote control door lock receiver will provide a ground signal through CKT 28 (BLK) to the horn relay which will sound the horn. See WIRING DIAGRAMS . This feature can be turned ON or OFF when programming the remote control door lock receiver. See TRANSMITTER under PROGRAMMING.

Courtesy Lighting

When the door unlock button on the transmitter is depressed, the remote control door lock receiver provides a ground on CKT 156 (WHT) to turn the courtesy lamps on. See WIRING DIAGRAMS . This provide courtesy lighting for approximately 30 seconds before timing out. Courtesy lighting can also be canceled by a KEY ON ignition cycle. The dome lamp defeat switch has no effect on the courtesy lighting that is activated by a remote transmission from the transmitter.

The remote control door lock receiver acts in much the same way as the interior lamp control module in that it receives a switched ground signal on CKT 157 (GRY) through the dome lamp defeat switch to CKT 328 (PPL) from the door jamb switches, and in turn grounds CKT 156 (WHT) to turn the courtesy lamps on. However, if the dome lamp defeat switch is ON the remote control door lock receiver will not see the switched ground signal from the door jamb switches when a door is opened and no courtesy lighting will be activated.

Data Link Input

The remote control door lock receiver is connected to the Data Link Connector (DLC) through CKT 1455 (BLK/WHT). See WIRING DIAGRAMS . When this circuit is grounded it allows the remote control door lock receiver to be programmed. See TRANSMITTER under PROGRAMMING.

DESCRIPTION (LUXURY KEYLESS ENTRY SYSTEM)

Note. This information does NOT apply to the Sierra and Silverado pickups.

LUXURY KEYLESS ENTRY SYSTEM

The keyless entry system operates by means of a transmitter. Use the transmitter to lock and unlock the vehicle doors. Use the transmitter to release the rear hatch or unlock the cargo doors. The Red button is for panic, it is intended to be used in case of an emergency to attract attention in an emergency situation. This feature activates the horn several times until turned off by pressing the Red button again. The transmitters are supplied in pairs with each vehicle. The transmitters are hand-held and attached to a key ring. The transmitter has four buttons to control the operation of the system. (Scheme 25) Whenever a button on the transmitter is pressed, the transmitter sends a coded Ultra-High Frequency (UHF) radio signal to the receiver.

The transmitter must be within approximately 30 feet (9 meters) of the vehicle for the receiver to detect the coded signal. The keyless entry system has no effect on the normal operation of the power door locks. The keyless entry system has no effect on the endgate or the liftgate window release. Each receiver is capable of recognizing four transmitters. Replacement transmitters may be obtained, but must be matched to the specific receiver. The transmitter is powered by a 3-volt battery and is water resistant. The system will turn on the interior lamps for about 40 seconds, or until the ignition is turned to the RUN position, when the doors are unlocked. The interior lamps will go off when the doors are locked.

Scheme 25

Press the UNLOCK button on the transmitter once to unlock the driver's side door. Press the UNLOCK button twice within a half a second, and no later than three seconds time to unlock the remaining doors.

Press the LOCK button on the transmitter to lock all the vehicle doors at once.

Press the REAR 2X button on the transmitter twice, within five seconds, to unlatch the liftgate window. The vehicle needs to be in Park or Neutral to operate this function.

Alarm/Panic Mode

The theft deterrent system provides a fourth Red button on the transmitter. This button is the alarm/panic button. If this button is pressed the vehicle horn will sound and the headlamps will flash. To turn this feature off, either push the panic button again or turn the ignition system to the RUN position. This feature will not work if the ignition is on or if the transmitter is 30 feet (9 meters) or more away from the vehicle.

When the unlock button on the transmitter is depressed once, the Body Control Module (BCM) sends a voltage signal through CKT 694 (TAN) to the left front door lock motor. See WIRING DIAGRAMS . Since CKT 295 (GRY) grounds through the door lock relay to CKT 150 (BLK) to G202, the drivers door unlocks.

Passenger Door Unlock

When the unlock button on the transmitter is depressed twice, the BCM unlocks the drivers door, and also sends a voltage signal through CKT 781 (ORN/BLK) to the door lock relay. See WIRING DIAGRAMS . This energizes the door unlock coil and voltage is sent through CKT 294 (TAN) to the right front, right rear, and left rear door lock motors.

When the rear unlock button is depressed twice, the BCM sends a voltage signal through CKT 253 (BRN) to the liftgate release relay. See WIRING DIAGRAMS . When the relay energizes voltage is applied through CKT 1576 (BLK) to the liftgate release motor, since CKT 1737 (YEL) grounds through the Park/Neutral Position Switch to CKT 150 (BLK) to G105, the liftgate is released. The vehicle must be in Park or Neutral for the liftgate to release.

When the rear door unlock button is depressed twice, the BCM sends a voltage signal through CKT 253 (BRN) to the cargo door lock relay. See WIRING DIAGRAMS . When the relay energizes, voltage is applied through CKT 56 (BLK) to the cargo door lock motor, since CKT 295 (GRY) grounds through the door lock relay to CKT 150 (BLK) to G202, the cargo door lock motor unlocks.

When the lock button on the transmitter is depressed, the remote control door lock receiver sends a voltage signal through CKT 195 (LT BLU) to the door lock relay. See WIRING DIAGRAMS . This energizes the door lock coil and voltage is sent through CKT 295 (GRY) to the left front, right front, left rear, right rear and cargo door lock motors. Since CKT 694 (TAN) internally grounds the left front door lock motor in the remote control door lock receiver, CKT 294 (TAN) grounds the right front, left rear and right rear door lock motors through the door lock relay to CKT 150 (BLK) to G202 and CKT 56 (BLK/WHT) grounds the cargo door lock motor through the remote control door lock receiver back to CKT 294 (TAN), all doors lock.

When the door lock button is depressed, all doors will lock, and also the remote control door lock receiver will provide a ground signal through CKT 28 (BLK) to the horn relay which will sound the horn.

COMPONENT LOCATIONS

COMPONENT LOCATIONS

Scheme 26

Scheme 27

Scheme 28

Scheme 29

Scheme 30

Scheme 31

Scheme 32

Scheme 33

Scheme 34

Scheme 35

Scheme 36

Scheme 37

Scheme 38

Scheme 39

Scheme 40

Scheme 41

Scheme 42

Scheme 43

Scheme 44

Scheme 45

Scheme 46

Scheme 47

If the key is in the ON position during the programming procedure, the horn chirp will be disabled. If the key is in the OFF position, the horn chirp will be enabled. The horn will chirp when the lock button is pressed two times.

When reprogramming the remote control door lock receiver, all transmitters must be programmed at this time for the transmitters to operate the vehicle. Transmitters not programmed at this time will not work, and the procedure will have to be redone with all the transmitters.

1. Ground pin 4 to pin 8 of the Data Link Connector (DLC). (Scheme 48) The receiver will respond by locking and unlocking the doors, and activating the liftgate window release, if equipped, within 2 seconds.
2. Press and hold the LOCK and UNLOCK buttons simultaneously on the first transmitter to be programmed until door locks cycle, approximately 10 seconds.
3. Repeat step 2 for up to four total transmitters to be programmed, if available. The receiver will respond by locking and unlocking the doors, and activating the liftgate window release, if equipped, within 2 seconds.
4. Remove the ground jumper from the DLC.
5. Lock and unlock the doors to verify the transmitter operation.
6. Activate the rear window release to verify the transmitter operation.

Scheme 48

Have each of the transmitters that you intend to program ready. This vehicle will allow you to program a maximum of four transmitters at one time.

When reprogramming the remote control door lock receiver, all transmitters must be programmed at this time for the transmitters to operate this vehicle. Transmitters not programmed at this time will not work, and the procedure will have to be redone with all the transmitters.

1. Turn the ignition to the RUN position, then back to the OFF position. This will disarm the theft-deterrent system.
2. Remove the RADIO fuse 17.
3. Turn the ignition from the OFF position to the RUN position three times quickly, within five seconds. The vehicle will respond by locking the doors, unlocking the driver's door and releasing the tailgate or cargo doors. The transmitter is now ready to match to the vehicle.
4. Press and hold the LOCK and UNLOCK buttons on the first transmitter for 15 seconds. The vehicle will respond as in step 3) .
5. Repeat step 4 for the remaining transmitters.
6. Replace the RADIO Fuse.
7. Check that all transmitters work by pressing their buttons.

TRANSMITTER SYNCHRONIZATION

1. Transmitter synchronization may be necessary due to the security method used by the RKE system. The transmitter does not send the same signal twice to the receiver.
2. The receiver will not respond to a signal which has been previously sent. This prevents anyone from recording and playing back the signal from the transmitter.
3. Resynchronization will be necessary if any of the following occur: You change the transmitter battery. You disconnect the vehicle battery. You push the transmitter button 256 times out of the range of the receiver.
4. In order to synchronize the transmitter with the receiver, perform the following: Stand close to the vehicle. Simultaneously press and hold the LOCK and UNLOCK buttons on the transmitter for seven seconds. The door locks should cycle to confirm synchronization.

PRELIMINARY INSPECTION

Verify customer complaint by operating system. Visually inspect for obvious signs of mechanical and electrical damage. Inspect for blown fuses and damaged relays. For fuse and/or relay identification, refer to illustrations. (Scheme 49)and (Scheme 50). Inspect for loose or corroded connections, damaged wiring harnesses and/or switches. Check for a broken or partially broken wire inside insulation, which could cause system malfunction but prove good in a continuity/voltage check with system disconnected. Ensure any aftermarket electronic equipment is properly installed. If fault is found, repair as necessary.

Scheme 49

Scheme 50

REMOTE KEYLESS ENTRY SYSTEM CHECK

To perform system check, refer to illustration. (Scheme 51)

Note. For testing procedures resulting from abnormal results in (Scheme 51), see SYSTEM TESTS.

Scheme 51

TRANSMITTER

1. Check transmitter number on back side of case.
2. Assure the correct transmitter is being replaced. It is possible to have up to four transmitters with the same number.
3. Reprogram remote control door lock receiver. See «TRANSMITTER»(/cadillac/escalade/gmt400-1998-2000/remont/door-locks-anti-theft-systems/#keyless-entry-system-remote__transmitter) under PROGRAMMING.
4. Discard old non-working transmitter.

Transmitter Test

The number below refers to the step number on the flow chart

1. Step 2 If any, but not all of the buttons are inoperative, the transmitter is malfunctioning, and must be replaced. If all of the buttons are inoperative, the transmitter battery may need to be replaced.
2. Step 4 If any or all of the buttons are inoperative after battery replacement, the transmitter is malfunctioning, and must be replaced.

To perform transmitter check, refer to illustration. See

(Scheme 52)

Note. Testing procedures for RKE System Does Not Program can be found in SYSTEM TESTS .

Scheme 52

SYSTEM TESTS

Note. To prevent damage to terminal, connector Test Adaptor Kit (J 35616-A) must be used whenever a diagnostic procedure requires checking or probing a terminal.

SYMPTOM INDEX

TEST A: COURTESY LIGHTS INOPERATIVE WITH TRANSMITTER

For test procedure, refer to illustration. (Scheme 53)

Scheme 53

TEST B: DOOR LOCKS INOPERATIVE WITH TRANSMITTER (ALL)

For test procedure, refer to illustrations. (Scheme 54)and (Scheme 55).

Scheme 54

Scheme 55

TEST C: DOOR LOCK/UNLOCK INOPERATIVE (LEFT FRONT)

For test procedure, refer to illustrations. (Scheme 56)and (Scheme 57).

Scheme 56

Scheme 57

TEST D: DOOR LOCK/UNLOCK INOPERATIVE WITH TRANSMITTER (REAR EXCEPT LUXURY)

For test procedure, refer to illustrations. (Scheme 55)and (Scheme 58).

Scheme 58

TEST E: DOOR LOCK/UNLOCK INOPERATIVE WITH TRANSMITTER (REAR LUXURY)

Note. For terminal identification, see WIRING DIAGRAMS .

For test procedure, refer to illustration. (Scheme 59)

Scheme 59

TEST F: DOOR UNLOCK INOPERATIVE WITH TRANSMITTER (ALL)

For test procedure, refer to illustrations. (Scheme 55)and (Scheme 60).

Scheme 60

TEST G: LIFTGATE WINDOW RELEASE INOPERATIVE WITH TRANSMITTER (EXCEPT LUXURY)

For test procedure, refer to illustrations. (Scheme 55)and (Scheme 61).

Scheme 61

TEST H: LIFTGATE WINDOW RELEASE INOPERATIVE WITH TRANSMITTER (LUXURY)

Note. For terminal identification, see WIRING DIAGRAMS .

For test procedure, refer to illustration. (Scheme 62)

Scheme 62

TEST I: PANIC MODE INOPERATIVE

For test procedure, refer to illustrations. (Scheme 63)and (Scheme 64).

Scheme 63

Scheme 64

TEST J: REMOTE KEYLESS ENTRY SYSTEM DOES NOT CHANGE CUSTOMIZATION MODES

For test procedure, refer to illustrations. (Scheme 55)and (Scheme 65).

Scheme 65

TEST K: REMOTE KEYLESS ENTRY SYSTEM DOES NOT PROGRAM (EXCEPT LUXURY)

For test procedure, refer to illustrations. (Scheme 48), (Scheme 55) and (Scheme 66).

Scheme 66

TEST L: REMOTE KEYLESS ENTRY SYSTEM DOES NOT PROGRAM (LUXURY)

For test procedure, refer to illustrations. (Scheme 64)and (Scheme 67).

Scheme 67

TEST M: REMOTE KEYLESS ENTRY SYSTEM INOPERATIVE (EXCEPT LUXURY)

For test procedure, refer to illustrations. (Scheme 55)and (Scheme 68).

Scheme 68

REMOVAL & INSTALLATION

Scheme 69

1. Remove Daytime Running Lights (DRL) module from behind lower left side of instrument panel. (Scheme 69)
2. Disconnect electrical connector.
3. Remove remote control door lock receiver retainer. (Scheme 70)
4. Remove remote control door lock receiver.

Scheme 70

Installation

1. Install remote control door lock receiver.
2. Install remote control door lock receiver retainer.
3. Connect electrical connector.
4. Install DRL module.
5. Inspect the circuit operation of the DRL Module.

Removal

1. Open transmitter case. Insert a dime between the 2 halves of the transmitter case at the slot provided near the key ring hole. Twist the dime.
2. Remove the battery from the transmitter.

1. Install battery to the transmitter case with the positive (+) side down. Use a Panasonic(R) 3-volt CR3032, or an equivalent battery.
2. Close the transmitter case by aligning the 2 sides of the case and snapping the case together.
3. Synchronize the transmitter. See «TRANSMITTER SYNCHRONIZATION»(/cadillac/escalade/gmt400-1998-2000/remont/door-locks-anti-theft-systems/#keyless-entry-system-remote__transmitter-synchronization) under PROGRAMMING.
4. Verify the system operates properly. See «REMOTE KEYLESS ENTRY SYSTEM CHECK»(/cadillac/escalade/gmt400-1998-2000/remont/door-locks-anti-theft-systems/#keyless-entry-system-remote__remote-keyless-entry-system-check) under TROUBLE SHOOTING.

Scheme 71

Scheme 72

Scheme 73

Scheme 74

Scheme 75

Scheme 76

Scheme 77

See also:
• WIRING DIAGRAMS
• TRANSMITTER
• SYSTEM TESTS
• A
• B
• C
• D
• E
• F
• G
• H
• I
• J
• K
• L
• M
• TRANSMITTER SYNCHRONIZATION
• REMOTE KEYLESS ENTRY SYSTEM CHECK