Pinpoint Test H: The Keyless Entry Keypad Illumination Is Inoperative/Does Not Operate Correctly
Handles, Locks, Latches and Entry Systems
Pinpoint Test H: The Keyless Entry Keypad Illumination Is Inoperative/Does Not Operate Correctly
Refer to Wiring Diagrams Set 117, Remote Keyless Entry and Alarm for schematic and connector information. Electrical Diagrams
Normal Operation
When any keypad button is touched the Smart Junction Box (SJB) sends voltage to the keyless entry keypad LEDs on the illumination circuit to assist the driver in entering an access code at night. The keypad is also illuminated anytime the courtesy lighting is on.
The keyless entry keypad is a touch sensitive capacitive sensor. When a finger touches the keypad it changes the capacitance of the sensor in the area of the finger touch. The keypad is then able to determine which area was touched and sends a ground signal to the SJB (Smart Junction Box) on the corresponding reference circuit(s). The keypad only works when touched with a finger. The keyless entry keypad may not work when gloves are worn. The gloves act as an insulator and do not allow the finger to change the sensor capacitance.
- DTC B1624 (Lamp Keypad Output Open Circuit)- a continuous and on-demand DTC that sets when the SJB (Smart Junction Box) detects the keyless entry keypad illumination output circuit is open or shorted to voltage.
- DTC B1626 (Lamp Keypad Output Short Circuit To Ground)- an on-demand DTC that sets when the SJB (Smart Junction Box) detects the keyless entry keypad illumination output circuit is shorted to ground.
This pinpoint test is intended to diagnose the following:
- Wiring, terminals or connectors
- Keyless entry keypad
- SJB (Smart Junction Box)
PINPOINT TEST H : THE KEYLESS ENTRY KEYPAD ILLUMINATION IS INOPERATIVE/DOES NOT OPERATE CORRECTLY
NOTICE: Use the correct probe adapter(s) when making measurements. Failure to use the correct probe adapter(s) may damage the connector.
H1 CHECK THE KEYLESS ENTRY KEYPAD ILLUMINATION
- Ignition OFF.
- Check the keyless entry keypad illumination.
Is the keyless entry keypad illumination always on?
Yes
GO to H9.
No
GO to H2.
H2 CHECK THE KEYLESS ENTRY KEYPAD INPUT TO THE SJB (Smart Junction Box)
- Enter the following diagnostic mode on the scan tool: SJB (Smart Junction Box) DataLogger.
- Touch several keyless entry keypad buttons while observing the SJB (Smart Junction Box) PID (KEY_PAD).
Does the PID display correct values?
Yes
GO to H3.
No
GO to Pinpoint Test G. Pinpoint Test G: The Doors Do Not Lock/Unlock Using The Keyless Entry Keypad
H3 CHECK THE RECORDED SJB (Smart Junction Box) DTCs FROM THE SELF-TEST
- Check the recorded results from the SJB (Smart Junction Box) self-test.
Is DTC B1626 present?
Yes
GO to H4.
No
GO to H6.
H4 CHECK THE KEYLESS ENTRY KEYPAD FOR A SHORT TO GROUND
- Disconnect: Keyless Entry Keypad C500.
- Clear the DTCs, then repeat the SJB (Smart Junction Box) self-test.
Is DTC B1626 recorded?
Yes
GO to H5.
No
INSTALL a new keyless entry keypad. REFER to Keyless Entry Keypad . TEST the system for normal operation.
H5 CHECK THE KEYLESS ENTRY KEYPAD ILLUMINATION CIRCUIT FOR A SHORT TO GROUND
- Ignition OFF.
- Disconnect: SJB (Smart Junction Box) C2280C.
- Measure the resistance between the keyless entry keypad C500-2, circuit CPK28 (WH/GN), harness side and ground.
Is the resistance greater than 10,000 ohms?
Yes
GO to H10.
No
REPAIR circuit CPK28 (WH/GN) for a short to ground. CLEAR the DTCs. REPEAT the self-test.
H6 CHECK THE KEYLESS ENTRY KEYPAD ILLUMINATION CIRCUIT FOR REFERENCE VOLTAGE
NOTE: The SJB (Smart Junction Box) sends out a constant reference voltage on circuit CPK28 (WH/GN) for its own circuit diagnostics. This voltage is 10 volts ± 1 volt.
- Measure the voltage between the keyless entry keypad C500-2, circuit CPK28 (WH/GN), harness side and ground.
Are 10 volts (± 1 volt) present?
Yes
GO to H7.
No
GO to H8.
H7 CHECK FOR SJB (Smart Junction Box) OUTPUT
- Enter the following diagnostic mode on the scan tool: SJB (Smart Junction Box) DataLogger.
- Measure the voltage between the keyless entry keypad C500-2, circuit CPK28 (WH/GN), harness side and ground while active commanding the SJB (Smart Junction Box) PID (KY_PAD_LMP) ON.
Is the voltage greater than 11 volts?
Yes
INSTALL a new keyless entry keypad. REFER to Keyless Entry Keypad . TEST the system for normal operation.
No
GO to H10.
H8 CHECK THE KEYLESS ENTRY KEYPAD ILLUMINATION CIRCUIT FOR AN OPEN
- Ignition OFF.
- Disconnect: SJB (Smart Junction Box) C2280C.
- Measure the resistance between the keyless entry keypad C500-2, circuit CPK28 (WH/GN), harness side and the SJB (Smart Junction Box) C2280C-11, circuit CPK28 (WH/GN), harness side.
Is the resistance less than 5 ohms?
Yes
GO to H10.
No
REPAIR circuit CPK28 (WH/GN) for an open. TEST the system for normal operation.
H9 CHECK THE KEYLESS ENTRY KEYPAD ILLUMINATION CIRCUIT FOR A SHORT TO VOLTAGE
- Disconnect: SJB (Smart Junction Box) C2280C.
- Ignition ON.
- Observe the keypad illumination.
Is the keypad still illuminated?
Yes
REPAIR the circuit. TEST the system for normal operation.
No
GO to H10.
H10 CHECK FOR CORRECT SJB (Smart Junction Box) OPERATION
- Disconnect all the SJB (Smart Junction Box) connectors.
- Check for:
- corrosion
- damaged pins
- pushed-out pins
- Connect all the SJB (Smart Junction Box) 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 SJB (Smart Junction Box). 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.