Circuit/System Testing

Remote Function Actuator Module Malfunction

1. Ignition OFF, disconnect the harness connector at the K77 Remote Function Actuator Module, ignition ON.
2. Verify a test lamp illuminates between each B+ circuit terminal 1 and ground.
   • If the test lamp does not illuminate and the circuit fuse is good 
   1. Ignition OFF, remove the test lamp.
   2. Test for less than 2 Ω in the B+ circuit end to end.
      • If 2 Ω or greater, repair the open/high resistance in the circuit.
      • If less than 2 Ω, verify the fuse is OK and there is voltage at the fuse.
   • If the test lamp does not illuminate and the circuit fuse is open 
   1. Ignition OFF, remove the test lamp.
   2. Test for infinite resistance between the B+ circuit and ground.
      • If less than infinite resistance, repair the short to ground on the circuit.
      • If infinite resistance, replace the K77 Remote Function Actuator Module.
   • Go to next step: If the test lamp illuminates 
3. Ignition OFF.
4. Ignition OFF and all vehicle systems OFF, scan tool disconnected, disconnect the harness connector at the K77 Remote Function Actuator Module. It may take up to 2 min for all vehicle systems to power down.
5. Test for less than 30 Ω between the low reference circuit terminal 4 and ground.
   • If 10 Ω or greater 
   1. Ignition OFF.
   2. Test for less than 2 Ω in the ground circuit end to end.
      • If 2 Ω or greater, repair the open/high resistance in the circuit.
      • If less than 2 Ω, repair the open/high resistance in the ground connection.
   • Go to next step: If less than 10 Ω 
6. Ignition ON.
7. Test for greater than 11.5 V between the B+ circuit terminal 1 and ground.
   • If 11.5 V or less 
   1. Ignition OFF, disconnect the harness connector at the K9 Body Control Module.
   2. Test for infinite resistance between the B+ circuit and ground.
      • If less than infinite resistance, repair the short to ground on the circuit.
      • Go to next step: If Infinite resistance.
   3. Test for less than 2 Ω in the B+ circuit end to end.
      • If 2 Ω or greater, repair the open/high resistance in the circuit.
      • If less than 2 Ω, replace the K9 Body Control Module.
   • Go to next step: If greater than 11.5 V 
8. Test for 0.001 - 12 V between the serial data circuit terminal 2 and ground.
   • If less than 0.001 V 
   1. Ignition OFF, disconnect the harness connector at the K9 Body Control Module.
   2. Test for infinite resistance between the serial data circuit and ground.
      • If less than infinite resistance, repair the short to ground on the circuit.
      • Go to next step: If infinite resistance
   3. Test for less than 2 Ω in the serial data circuit end to end.
      • If 2 Ω or greater, repair the open/high resistance in the circuit.
      • If less than 2 Ω, replace the K9 Body Control Module.
   • If greater than 12 V 
   1. Ignition OFF, disconnect the harness connector at the K9 Body Control Module, ignition ON.
   2. Test for less than 0.001 V between the serial data circuit and ground.
      • If 0.001 V or greater, repair the short to voltage on the circuit.
      • If less than 0.001 V, replace the K9 Body Control Module.
   • Go to next step: If between 0.001 - 12 V 
9. Ignition OFF, disconnect the X8 harness connectors at the K9 Body Control Module, ignition ON.
10. Test for less than 0.001 V between the K9 Body Control Module serial data circuit terminal 17 X8 and ground.
    • If 0.001 V or greater 

      Repair the short to voltage on the circuit.

    • Go to next step: If less than 0.001 V 
11. Ignition OFF.
12. Test for infinite resistance between the K9 Body Control Module serial data circuit terminal 17 X8 and ground.
    • If less than infinite resistance 

      Repair the short to ground on the circuit.

    • Go to next step: If infinite resistance 
13. Test for less than 2 Ω between the K9 Body Control Module serial data circuit terminal 17 X8 and the K77 Remote Function Actuator Module serial data circuit terminal 2.
    • If 2 Ω or greater 

      Repair the open/high resistance in the circuit.

    • Go to next step: If less than 2 Ω 
14. Replace the K77 Remote Function Actuator Module.
15. Verify the keyless entry functions operate.
    • If the keyless entry functions do not operate 

      Replace the K9 Body Control Module

    • Go to next step: If the keyless entry functions operate 
16. All OK.

Keyless Entry Antenna Malfunction

1. Verify the scan tool Exterior Driver Door Handle Switch, Exterior Passenger Door Handle Switch, and Trunk Lid Exterior Unlatch Switch parameters change between Active and Inactive while operating their respective exterior door handle/rear closure touch pad.
   • If any of the parameters does not change 

     Refer to Exterior Door Handle Switch Malfunction .

   • Go to next step: If all of the parameters change 
2. All OK.
3. Remove and reinstall the transmitter battery, do not replace the battery. Verify the function.
NOTE:

Verify the antenna is installed correctly and not damaged.

4. Ignition OFF, disconnect the harness connector at the appropriate T10 Keyless Entry Antenna that is related to the fault condition, ignition ON.
5. Test for less than 1 V between the signal circuit terminal 1 and ground.
   • If 1 V or greater 
   1. Ignition OFF, disconnect the harness connector at the K9 Body Control Module, ignition ON.
   2. Test for less than 1 V between the signal circuit and ground.
      • If 1 V or greater, repair the short to voltage on the circuit.
      • If less than 1 V, replace the K9 Body Control Module.
   • Go to next step: If less than 1 V 
NOTE:

When using the MIN MAX function, autorange on the DMM may not function properly. To ensure accurate test results, turn off autorange and manually set the DMM range to 000.0 V.

6. Ignition OFF, install a DMM between the signal circuit terminal 1 and ground. Set the DMM to capture DC voltage using the MIN MAX function. Turn off autorange and manually set the DMM range to 000.0 V.
7. Lock the vehicle doors using the keyless entry transmitter. Activate the antenna by operating the appropriate exterior door handle/rear closure touch pad.
8. Verify the MAX voltage captured by the DMM is greater than 1 V.
   • If 1 V or less 
   1. Ignition OFF, disconnect the harness connector at the K9 Body Control Module.
   2. Test for infinite resistance between the signal circuit and ground.
      • If less than infinite resistance, repair the short to ground on the circuit.
      • Go to next step: If infinite resistance
   3. Test for less than 2 Ω in the signal circuit end to end.
      • If 2 Ω or greater, repair the open/high resistance in the circuit.
      • If less than 2 Ω, replace the K9 Body Control Module.
   • Go to next step: If greater than 1 V 
9. Test for less than 1 V between the low reference circuit terminal 2 and ground.
   • If 1 V or greater 
   1. Ignition OFF, disconnect the harness connector at the K9 Body Control Module, ignition ON.
   2. Test for less than 1 V between the low reference circuit and ground.
      • If 1 V or greater, repair the short to voltage on the circuit.
      • If less than 1 V, replace the K9 Body Control Module.
   • Go to next step: If less than 1 V 
NOTE:

When using the MIN MAX function, autorange on the DMM may not function properly. To ensure accurate test results, turn off autorange and manually set the DMM range to 000.0 V.

10. Install a DMM between the signal circuit terminal 1 and the low reference circuit terminal 2. Set the DMM to capture DC voltage using the MIN MAX function. Turn off autorange and manually set the DMM range to 000.0 V.
11. Lock the vehicle doors using the keyless entry transmitter. Activate the antenna by operating the appropriate exterior door handle/rear closure touch pad.
12. Verify the MAX voltage captured by the DMM is greater than 1 V.
    • If 1 V or less 
    1. Ignition OFF, disconnect the harness connector at the K9 Body Control Module.
    2. Test for infinite resistance between the low reference circuit and ground.
       • If less than infinite resistance, repair the short to ground on the circuit.
       • Go to next step: If infinite resistance
    3. Test for less than 2 Ω in the low reference circuit end to end.
       • If 2 Ω or greater, repair the open/high resistance in the circuit.
       • If less than 2 Ω, replace the K9 Body Control Module.
    • Go to next step: If greater than 1 V 
13. Replace the appropriate T10 Keyless Entry Antenna.
14. Lock the vehicle doors using the keyless entry transmitter. Activate the antenna by operating the appropriate exterior door handle/rear closure touch pad.
15. Verify that the door/rear compartment unlocks and opens when the exterior door handle/rear closure touch pad is operated.
    • If the door/rear compartment does not unlock and open 

      Replace the K9 Body Control Module.

    • Go to next step: If the door/rear compartment unlocks and opens 
16. All OK.

Keyless Entry Transmitter Malfunction

1. Ignition ON.
2. Verify that DTC B1442, B1444, B1446, B1451, B1511, B1513, or B15EE is not set.
   • If any of the DTCs are set 

     Refer to Diagnostic Trouble Code (DTC) List - Vehicle .

   • Go to next step: If none of the DTCs are set 
3. Verify the Tire Pressure Monitoring System is functioning by adding air to one tire to see the air pressure display increase.
   • If the pressure does not increases 

     Refer to Symptoms - Tire Pressure Monitoring

   • Go to next step: If the pressure increases 
4. Verify the VIN information for the vehicle transmitter is correct using the EL-52545  .
   • If the VIN is blank 

     Refer to Remote Control Door Lock and Theft Deterrent Transmitter Programming 

   • If the VIN is incorrect 

     This transmitter is not for this vehicle, it may already be programmed to work with a different vehicle but cannot be programmed to this vehicle.

   • Go to next step: If the VIN is correct 
5. Verify the frequency of the transmitter matches the frequency of the Tire Pressure Monitoring System using the EL-52545  .
   • If the transmitter frequency is incorrect 

     Replace the vehicle transmitter.

   • Go to next step: If the transmitter frequency is correct 
6. Verify the part number information for the vehicle transmitter is correct using the EL-52545  .
   • If the vehicle transmitter part number is incorrect 

     Replace the vehicle transmitter.

   • Go to next step: If the vehicle transmitter part number is correct 
7. Verify the transmitter output is above 20% on the EL-52545  signal strength meter by pressing a button on the transmitter ten times.
   • If the transmitter output is lower than 20% 

     Replace the transmitter battery.

   NOTE:

   Before replacing the transmitter, inspect the transmitter battery contacts for any corrosion or damage. If no corrosion or damage is found, replace the transmitter battery and retest before replacing the transmitter.
   • Go to next step: If the transmitter output is higher than 20% 
8. Using the scan tool read the number of transmitters learned in the K9 Body Control Module. Using the EL-52545  read the number of transmitters learned in the transmitter.
   • If the transmitters learned is less than the number programmed 

     Program the transmitter. Refer to Remote Control Door Lock and Theft Deterrent Transmitter Programming .

   • Go to next step: If the transmitters learned is equal to the number programmed 
9. Using the EL-52545  verify the transmitter is responding to the antenna by placing the transmitter next to the EL-52545  and select RF auto detect on the tool then press the transmitter button. The EL-52545  should display a high frequency (315 MHz or 433 MHz) reading when the button is pressed.
   • If the high frequency (315 MHz or 433 MHz) response does not display 

     Program the transmitter. Refer to Remote Control Door Lock and Theft Deterrent Transmitter Programming .

   1. Using the EL-52545  verify the transmitter is responding to the antenna by placing the transmitter next to the EL-52545  and select RF auto detect on the tool then press the transmitter button. The EL-52545  should display a high frequency (315 MHz or 433 MHz) reading when the button is pressed.
      • If the high frequency (315 MHz or 433 MHz) does not display. Replace the vehicle transmitter
   • Go to next step: If the high frequency (315 MHz or 433 MHz) does display 
10. Verify the scan tool Exterior Driver Door Handle Switch, Exterior Passenger Door Handle Switch, and Trunk Lid Exterior Unlatch Switch parameters change between Active and Inactive while operating their respective exterior door handle/rear closure touch pad.
    • If any of the parameters does not change 

      Refer to Exterior Door Handle Switch Malfunction , or Liftgate Release Malfunction (TB4) , or Liftgate Release Malfunction (TC2) .

    • Go to next step: If all of the parameters change 
11. Lock the vehicle using the keyless entry transmitter.
12. Verify that each door and rear compartment unlocks and opens by approaching the vehicle with a valid transmitter and operating their exterior door handle/rear closure touch pad.
    • If both doors and the rear compartment do not unlock/unlatch and open 
    1. Replace the transmitter battery.
    2. Lock the vehicle using the keyless entry transmitter.
    3. Verify that each door and rear compartment unlocks and opens by approaching the vehicle with a valid transmitter and operating their respective release handle/touch pad.
       • If both doors and the rear compartment do not unlock/unlatch and open, replace the keyless entry transmitter.
       • Go to next step: If both doors and the rear compartment unlock/unlatch and open
    4. All OK.
    • Go to next step: If both doors and the rear compartment unlock/unlatch and open 
13. The concern may be caused by temporary RF interference. Discuss the conditions in which the concern occurs with the customer. RF interference from aftermarket devices such as 2-way radios, power inverters, cellular phone chargers, computers, etc. may cause a system malfunction. High RF traffic areas, such as gas stations which use pay-at-the-pump RF transponders, may also cause interference that could lead to a malfunction.