Pinpoint Test AB: The Doors Do Not Lock/Unlock Using The Keyless Entry Keypad
Handles, Locks, Latches and Entry Systems - With Intelligent Access (IA)
Pinpoint Test AB: The Doors Do Not Lock/Unlock Using The Keyless Entry Keypad
Normal Operation
The Remote Function Actuator (RFA) module monitors for a ground signal on the keyless entry keypad signal input circuits. When an individual keypad button is pressed, an individual or combination of the input circuits is routed to ground. The RFA (Remote Function Actuator) module then determines which button was touched based on which circuit(s) are grounded. The keypad has a dedicated ground circuit. Once the RFA (Remote Function Actuator) module determines that the 5-digit personal entry code, or the factory set 5-digit entry code has been entered on the keypad, the RFA (Remote Function Actuator) module unlocks the driver door (if stepped unlock is enabled).
To unlock all of the doors (if stepped unlock is disabled), press the 3/4 button within 5 seconds of entering the 5-digit code.
To lock all of the doors, the 5-digit code does not need to be entered. Press the 7/8 and 9/0 buttons at the same time.
The permanent keyless entry keypad code is permanently stored in the Body Control Module (BCM) and cannot be changed. The code is also printed on a label, located on the BCM (Body Control Module). The permanent code from the BCM (Body Control Module) is programmed into the RFA (Remote Function Actuator) module. The permanent keypad code can also be retrieved with the scan tool. The scan tool retrieves and displays the permanent keycode from the RFA (Remote Function Actuator) module.
- DTC B121B:11 (Keypad Input Switch: Circuit Short To Ground)- an on-demand DTC that sets when the RFA (Remote Function Actuator) module detects a short to ground on any of the keyless entry keypad input circuits.
This pinpoint test is intended to diagnose the following:
- Wiring, terminals or connectors
- Keyless entry keypad
- RFA (Remote Function Actuator) module
PINPOINT TEST AB : THE DOORS DO NOT LOCK/UNLOCK USING THE KEYLESS ENTRY KEYPAD
NOTICE: Use the correct probe adapter(s) when making measurements. Failure to use the correct probe adapter(s) may damage the connector.
AB1 COMPARE THE KEYCODE PID
NOTE: The permanent keypad code in the scan tool does not display even numbers. If the permanent code has even numbers in it, the scan tool displays an odd number that corresponds with the same button on the keypad. For example, if the keycode contains the number 2, the scan tool displays the number 1 in its place.
- Enter the following diagnostic mode on the scan tool: Keyless Entry Keypad Code.
NOTE: The keyless entry keypad code is located under Toolbox>Body>Security.
- Observe and record the keyless entry keypad code using the scan tool.
- Obtain the keyless entry keypad code from the label on the BCM (Body Control Module) or from the Owner's Literature.
Does the keycode from the scan tool correspond with the keycode from the BCM (Body Control Module) label or Owner's Literature?
Yes
GO to AB2.
No
REFER to Keyless Entry Keypad Code Programming Keyless Entry Keypad Code Programming. CARRY OUT the keyless entry keypad code reset. TEST the system for normal operation.
AB2 CHECK THE KEYCODE
- Enter the 5-digit permanent entry code on the keyless entry keypad, then press the 3/4 button.
Do the doors unlock?
Yes
The system is operating as designed. INFORM the customer of the correct system operation.
No
GO to AB3.
AB3 RETRIEVE THE RECORDED RFA (Remote Function Actuator) MODULE DTCs FROM THE SELF-TEST
- Check for recorded RFA (Remote Function Actuator) module DTCs from the self-test.
Is DTC B121B:11 recorded?
Yes
GO to AB4.
No
GO to AB6.
AB4 REPEAT THE RFA (Remote Function Actuator) MODULE SELF-TEST
- Disconnect: Keyless Entry Keypad C500.
- Clear the DTCs, then repeat the RFA (Remote Function Actuator) module self-test.
Is DTC B121B:11 recorded?
Yes
GO to AB5.
No
INSTALL a new keyless entry keypad. REFER to Keyless Entry Keypad Service and Repair. TEST the system for normal operation.
AB5 CHECK THE KEYLESS ENTRY KEYPAD INPUT CIRCUITS FOR A SHORT TO GROUND
- Ignition OFF.
- Disconnect: RFA (Remote Function Actuator) Module C2153B.
- Measure the resistance between the keypad, harness side and ground as follows:
Connector-Pin Circuit C500-7 CPK29 (GY/BU) C500-5 CPK30 (VT/GN) C500-1 CPK31 (YE/GN)
Are the resistances greater than 10,000 ohms?
Yes
GO to AB11.
No
REPAIR the circuit in question for a short to ground. CLEAR the DTCs. REPEAT the self-test.
AB6 CHECK THE RFA (Remote Function Actuator) MODULE KEYPAD PIDs
- Enter the following diagnostic mode on the scan tool: RFA (Remote Function Actuator) DataLogger.
- Press each keyless entry keypad button while observing the RFA (Remote Function Actuator) module PIDs (Keypd_SW_1_2), (Keypd_SW_3_4), (Keypd_SW_5_6), (Keypd_SW_7_8) and (Keypd_SW_9_0).
Do the PIDs display the correct values?
Yes
GO to AB11.
No
GO to AB7.
AB7 CHECK THE KEYPAD GROUND CIRCUIT FOR AN OPEN
- Ignition OFF.
- Disconnect: Keyless Entry Keypad C500.
- Measure the resistance between the keyless entry keypad C500-2, circuit GD133 (BK), harness side and ground.
Is the resistance less than 5 ohms?
Yes
GO to AB8.
No
REPAIR circuit GD133 (BK) for an open. TEST the system for normal operation.
AB8 CHECK THE KEYLESS ENTRY KEYPAD
- Connect a fused jumper wire between the keyless entry keypad harness side, while monitoring the RFA (Remote Function Actuator) module PIDs as follows:
Keyless Entry Keypad Connector-Pin/ Circuit Keyless Entry Keypad Connector-Pin/ Circuit RFA (Remote Function Actuator) Module PID RFA (Remote Function Actuator) Module PID Display Value C500-7 CPK29 (GY/BU) C500-2 GD133 (BK) (Keypd_SW _1_2) Active C500-5 CPK30 (VT/GN) C500-5 GD133 (BK) (Keypd_SW _7_8) Active C500-1 CPK31 (YE/GN) C500-5 GD133 (BK) (Keypd_SW _9_0) Active
Do the PIDs display ACTIVE when the jumper wire is connected?
Yes
INSTALL a new keyless entry keypad. REFER to Keyless Entry Keypad Service and Repair.
No
GO to AB9.
AB9 CHECK THE KEYLESS ENTRY KEYPAD INPUT CIRCUITS FOR AN OPEN
- Ignition OFF.
- Disconnect: RFA (Remote Function Actuator) Module C2153B.
- Measure the resistance between the RFA (Remote Function Actuator) module, harness side and the keyless entry keypad, harness side as follows:
RFA (Remote Function Actuator) Module Connector-Pin Circuit Keyless Entry Keypad Connector-Pin C2153B-1 CPK29 (GY/BU) C500-7 C2153B-2 CPK30 (VT/GN) C500-5 C2153B-3 CPK31 (YE/GN) C500-1
Are the resistances less than 5 ohms?
Yes
GO to AB10.
No
REPAIR the circuit in question for an open. TEST the system for normal operation.
AB10 CHECK THE KEYLESS ENTRY KEYPAD INPUT CIRCUITS FOR A SHORT TO EACH OTHER
- Measure the resistance between the keypad, harness side as follows:
Keypad Connector-Pin/Circuit Keypad Connector-Pin/Circuit C500-7 CPK29 (GY/BU) C500-5 CPK30 (VT/GN) C500-7 CPK29 (GY/BU) C500-1 CPK31 (YE/GN) C500-5 CPK30 (VT/GN) C500-1 CPK31 (YE/GN)
Are the resistances greater than 10,000 ohms?
Yes
GO to AB11.
No
REPAIR the circuits in question. TEST the system for normal operation.
AB11 CHECK FOR CORRECT RFA (Remote Function Actuator) MODULE OPERATION
- Disconnect all the RFA (Remote Function Actuator) module connectors.
- Check for:
- corrosion
- damaged pins
- pushed-out pins
- Connect all the RFA (Remote Function Actuator) module connectors and make sure they seat correctly.
- Operate the system and verify the concern is still present.
Is the concern still present?
Yes
INSTALL a new RFA (Remote Function Actuator) module. TEST the system for normal operation.
No
The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector.