Pinpoint Test

CHECK THE KEYLESS ENTRY KEYPAD ILLUMINATION
1. Ignition OFF.
2. Check the keyless entry keypad illumination.
Is the keyless entry keypad illumination always on?
- Yes: GO to 9.
- No: GO to 2 .
CHECK THE KEYLESS ENTRY KEYPAD INPUT TO THE BCM
1. Using a scan tool, monitor the BCM PIDs KYPD_BTN_1/2, KYPD_BTN_7/8, and KYPD_BTN_9/0.
2. Touch several keyless entry keypad buttons while viewing the PIDs .
Do the PIDs display active when the corresponding button is touched?
- Yes: GO to 3 .
- No: REFER to Diagnostic Routine G: The Doors Do Not Lock Or Unlock Using the Keyless Entry Keypad
CHECK THE BCM DTCs FROM THE SELF-TEST
1. Using a scan tool, perform the BCM self-test.
Is DTC B121A:11 present?
- Yes: GO to 4 .
- No: GO to 6.
CHECK THE KEYLESS ENTRY KEYPAD FOR A SHORT TO GROUND
1. Disconnect: Keyless Entry Keypad.
2. Using a scan tool, clear the BCM DTCs .
3. Using a scan tool, perform the BCM self-test.
Is DTC B121A:11 present?
- Yes: GO to 5 .
- No: INSTALL a new keyless entry keypad. REFER to Keyless Entry Keypad .

CHECK THE KEYPAD ILLUMINATION OUTPUT CIRCUIT FOR A SHORT TO GROUND

Ignition OFF.
Disconnect: BCM C2280C.

Measure:

Keyless Entry Keypad			Ground

C500			Ground
Pin	Circuit	Measurement / Action	Pin	Circuit
2	CPK28 (WH/RD)		-	Ground

Is the resistance greater than 10, 000 ohms?

Yes: GO to 10.
No: REPAIR the circuit.

CHECK THE KEYPAD ILLUMINATION OUTPUT CIRCUIT FOR REFERENCE VOLTAGE

NOTE: The BCM sends out a constant reference voltage on circuit CPK28 (WH/RD) for its own circuit diagnostics. This voltage is 11 volts +/- 1 volt.

Disconnect Keyless Entry Keypad.

Measure:

Keyless Entry Keypad			Ground

C500			Ground
Pin	Circuit	Measurement / Action	Pin	Circuit
2	CPK28 (WH/RD)		-	Ground

Are 11 volts (+/- 1 volt) present?

Yes: GO to 7 .
No: GO to 8.

CHECK FOR BCM OUTPUT

NOTE: This pinpoint test checks for a voltage increase above the reference voltage checked in the previous pinpoint test when the keypad lamp is active commanded on.

Using a scan tool, view BCM PIDs .

While active commanding the BCM PID (KEY_PAD_LMP) ON, measure:

Keyless Entry Keypad			Ground

C500			Ground
Pin	Circuit	Measurement / Action	Pin	Circuit
2	CPK28 (WH/RD)		-	Ground

Does the voltage increase at least 1 volt greater than the reference voltage?

Yes: INSTALL a new keyless entry keypad. REFER to Keyless Entry Keypad .
No: GO to 10.

CHECK THE KEYPAD ILLUMINATION OUTPUT CIRCUIT FOR AN OPEN

Ignition OFF.
Disconnect BCM C2280C.

Measure:

Keyless Entry Keypad			BCM

C500			C2280C
Pin	Circuit	Measurement / Action	Pin	Circuit
2	CPK28 (WH/RD)		26	CPK28 (WH/GN)

Is the resistance less than 3 ohms?

Yes: GO to 10.
No: REPAIR the circuit.

CHECK THE KEYPAD ILLUMINATION OUTPUT CIRCUIT FOR A SHORT TO VOLTAGE
1. Disconnect BCM C2280C.
2. Ignition ON.
3. Observe the keypad illumination.
Is the keypad still illuminated?
- Yes: REPAIR the circuit.
- No: GO to 10 .
CHECK FOR CORRECT BCM OPERATION
1. Ignition OFF.
2. Disconnect and inspect all BCM connectors.
3. Repair:
  - corrosion (install new connector or terminals - clean module pins)
  - damaged or bent pins - install new terminals/pins
  - pushed-out pins - install new pins as necessary
4. Reconnect all BCM connectors. Make sure they seat and latch correctly.
5. Operate the system and determine if the concern is still present.
Is the concern still present?
- Yes: CHECK OASIS for any applicable TSBs . If a TSB exists for this concern, DISCONTINUE this test and FOLLOW TSB instructions. If no TSBs address this concern, INSTALL a new BCM. REFER to BODY CONTROL MODULE (BCM) - WITHOUT INTELLIGENT ACCESS (IA) .
- 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.