Pinpoint Test M : The Keyless Entry Keypad Illumination Is Inoperative
WARNING: This page is about a different car, the 2018 Lincoln Navigator. However, it is still accessible from the selected car via links, so may be relevant.
- M1 CHECK THE KEYLESS ENTRY KEYPAD OPERATION
- Press the 7/8 and 9/0 buttons simultaneously on the keyless entry keypad.
Do the doors lock using the keyless entry keypad?
Yes GO to M2 No GO to Pinpoint Test O - M2 CHECK FOR BCM (BODY CONTROL MODULE) DTC (DIAGNOSTIC TROUBLE CODE) B121A:11
- Ignition ON.
- Using a diagnostic scan tool, perform the BCM self-test.
Is DTC B121A:11 present?
Yes GO to M3 No GO to M5 - M3 CHECK THE KEYLESS ENTRY KEYPAD FOR A SHORT TO GROUND
- Ignition OFF.
- Disconnect: Keyless Entry Keypad C500 .
- Ignition ON.
- Using a diagnostic scan tool, clear the Diagnostic Trouble Codes (DTCs).
- Using a diagnostic scan tool, perform the BCM self-test.
Is DTC B121A:11 still present?
Yes GO to M4 No INSTALL a new keyless entry keypad. REFER to: Keyless Entry Keypad . - M4 CHECK THE KEYLESS ENTRY KEYPAD ILLUMINATION OUTPUT CIRCUIT FOR A SHORT TO GROUND
- Ignition OFF.
- Disconnect: BCM C2280E .
- Measure:
Positive Lead Measurement / Action Negative Lead C500-2 Ground
Is the resistance greater than 10, 000 ohms?
Yes GO to M7 No REPAIR the circuit. - M5 CHECK THE BCM (BODY CONTROL MODULE) OUTPUT USING THE KEYPAD LAMP OUTPUT STATUS (KEY_PAD_LMP) PID (PARAMETER IDENTIFICATION)
- Ignition OFF.
- Disconnect: Keyless Entry Keypad C500 .
- Ignition ON.
- Using a diagnostic scan tool, command the BCM KEY_PAD_LMP PID on.
- Measure:
Positive Lead Measurement / Action Negative Lead C500-2 Ground
Is the voltage greater than 11 volts?
Yes INSTALL a new keyless entry keypad. REFER to: Keyless Entry Keypad . No GO to M6 - M6 CHECK THE BCM (BODY CONTROL MODULE) KEYPAD ILLUMINATION OUTPUT CIRCUIT FOR AN OPEN
- Ignition OFF.
- Disconnect: BCM C2280E .
Is the resistance less than 3 ohms?
Yes GO to M7 No REPAIR the circuit. - M7 CHECK FOR CORRECT BCM (BODY CONTROL MODULE) OPERATION
- Disconnect and inspect all the BCM connectors.
- Repair:
- corrosion (install new connectors or terminals - clean module pins)
- damaged or bent pins - install new terminals pins
- pushed-out pins - install new pins as necessary
- Reconnect the BCM connectors and make sure they seat and latch correctly.
- Operate the system and determine if the concern is still present.
Is the concern still present?
Yes CHECK OASIS for any applicable service articles: TSB, GSB, SSM, or FSA. If a service article exists for this concern, DISCONTINUE this test and FOLLOW the service article instructions. If no service articles address this concern, BCM guided routine is not applicable for this vehicle and market. Replace the component that was faulted through service information diagnosis. No The system is operating correctly at this time. The concern may have been caused by module connections. ADDRESS the root cause of any connector or pin issues.