Pinpoint Test I: The Keyless Entry Keypad Illumination Is Inoperative/Does Not Operate Correctly
Locks, Latches and Entry Systems
Pinpoint Tests
Pinpoint Test I: The Keyless Entry Keypad Illumination Is Inoperative/Does Not Operate Correctly
Refer to Wiring Diagram Set 117 (Escape/Mariner, Escape Hybrid/Mariner Hybrid), Remote Keyless Entry and Alarm for schematic and connector information. Diagrams By Number
Normal Operation
When the Smart Junction Box (SJB) detects a keyless entry button is pressed, the SJB provides voltage to the keyless entry keypad through circuit CPK28 (WH/GN). Ground for the keyless entry keypad is provided through circuit GD182 (BK/GY).
- DTC B1624 (Lamp Keypad Output Open Circuit) - an on-demand DTC that sets when the SJB 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 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
PINPOINT TEST I: 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.
NOTE: Failure to disconnect the battery when instructed will result in false resistance readings. Refer to Battery.
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I1 CHECK THE KEYLESS ENTRY KEYPAD OPERATION
- Press the 7/8 and 9/0 on the keyless entry keypad.
- Do all the doors lock?
Yes
GO to I2.
No
Go To Pinpoint Test H. Pinpoint Test H: The Doors Do Not Lock/Unlock Using The Keyless Entry Keypad
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I2 CHECK THE RECORDED SJB DTCs FROM THE SELF-TEST
- Check the recorded results from the SJB self-test.
- Is DTC B1624 or B1626 present?
Yes
For DTC B1624, GO to I3.
For DTC B1626, GO to I9.
No
GO to I11.
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I3 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 I8.
No
GO to I4.
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I4 CHECK CIRCUIT CPK28 (WH/GN) FOR REFERENCE VOLTAGE
NOTE: The SJB sends out a constant reference voltage on circuit CPK28 (WH/GN) for its own circuit diagnostics. This voltage is 10 volts +/- 1 volt.
- Disconnect: Keyless Entry Keypad C500.
- 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 I6.
No
GO to I5.
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I5 CHECK CIRCUIT CPK28 (WH/GN) FOR AN OPEN
- Disconnect: SJB C2280c.
- Measure the resistance between the keyless entry keypad C500-2, circuit CPK28 (WH/GN), harness side and the SJB C2280c-11, circuit CPK28 (WH/GN), harness side.
- Is the resistance less than 5 ohms?
Yes
GO to I11.
No
REPAIR the circuit. CLEAR the DTCs. REPEAT the self-test.
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I6 CHECK FOR SJB OUTPUT
- Ignition ON.
- Enter the following diagnostic mode on the scan tool: SJB DataLogger.
- Measure the voltage between the keyless entry keypad C500-2, circuit CPK28 (WH/GN), harness side and ground while active commanding the SJB PID (KY_PAD_LMP) ON.
- Is the voltage greater than 11 volts?
Yes
GO to I7.
No
GO to I11.
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I7 CHECK CIRCUIT GD182 (BK/GY) FOR AN OPEN
- Disconnect: Negative Battery Cable.
- Measure the resistance between the keyless entry keypad C500-5, circuit GD182 (BK/GY), harness side and ground.
- Is the resistance less than 5 ohms?
Yes
INSTALL a new keyless entry keypad. REFER to Keyless Entry Keypad Service and Repair. CLEAR the DTCs. REPEAT the self-test.
No
REPAIR the circuit. CLEAR the DTCs. REPEAT the self-test.
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I8 CHECK CIRCUIT CPK28 (WH/GN) FOR A SHORT TO VOLTAGE
- Disconnect: SJB C2280c.
- Ignition ON.
- Observe the keypad illumination.
- Is the keypad still illuminated?
Yes
REPAIR the circuit. CLEAR the DTCs. REPEAT the self-test.
No
GO to I11.
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I9 CHECK THE KEYLESS ENTRY KEYPAD FOR A SHORT TO GROUND
- Disconnect: Keyless Entry Keypad C500.
- NOTE: DTC B1624 may set, and if set, should be ignored when carrying out this step.
- Clear the DTCs, then repeat the SJB self-test.
- Is DTC B1626 recorded?
Yes
GO to I10.
No
INSTALL a new keyless entry keypad. REFER to Keyless Entry Keypad Service and Repair. TEST the system for normal operation.
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I10 CHECK CIRCUIT CPK28 (WH/GN) FOR A SHORT TO GROUND
- Ignition OFF.
- Disconnect: SJB 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 I11.
No
REPAIR the circuit. CLEAR the DTCs. REPEAT the self-test.
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I11 CHECK FOR CORRECT SJB OPERATION
- Disconnect all the SJB connectors.
- Check for:
- corrosion
- damaged pins
- pushed-out pins
- Connect all the SJB 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. 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.
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