Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
Diagnostic Test
- READ AND RECORD DTCS AND ENVIRONMENTAL DATA - ERASE DTCS AND CHECK FOR DTC TO RETURN
- With the scan tool, read DTCs in all Electronic Control Units (ECUs) and record on the repair order.
- With the scan tool, run a vehicle Scan Report, or record the Environmental Data related to the DTCs.
- With the scan tool, erase all TBM2 DTCs.
- Turn the ignition off for a minimum of 10.0 seconds.
- Turn the ignition on.
- Using the recorded Environmental Data and the When Monitored Conditions above, operate the vehicle in the conditions that set the DTC.
- With the scan tool, read TBM2 DTCs.
Did the DTC return?
Yes
- Go To 2
No
- Perform the appropriate INTERMITTENT CONDITION diagnostic procedure. Refer to TESTING FOR AN INTERMITTENT CONDITION .
- CHECK THE ANTENNA CONNECTION NOTE:
Before performing the diagnostic test, please make sure that 9977-6-CELL-UPD 10K OHM jumper is connected to the 9977-6-CELL test antenna. Do NOT use the 9977-6-CELL-UPD 10K OHM jumper when using the 9977-6- CELL LTE test antenna.
- Turn the ignition off.
- Disconnect the Antenna connector at the back of the EAM.
- Inspect the Antenna connections.
Are the Antenna connections clean and secure?
Yes
- Go To 3
No
- Repair the Antenna connection as needed.
- Perform the BODY VERIFICATION TEST. Refer to BODY VERIFICATION TEST .
- CHECK THE ANTENNA AND CABLE
- Connect the 9977-6-CELL test antenna (special tool #9977-6-CELL, Adapter, Cellular Antenna Diagnostic)IF the special tool is not available connect the 9977-6-CELL LTE (special tool #9977-6-CELL-LTE, Adapter, Cellular Antenna Diagnostic) and adapter cable (special tool #9977-6-13, Adapter, Long RF RG-58 Fakra) to the antenna connection on the back of the EAM.
- Using the scan tool, erase the DTCs.
- Turn the ignition on.
Is the DTC active?
Yes
- Go To 5
No
- Go To 4
- TEST THE ANTENNA CABLE
- Disconnect the Antenna cable at the base.
- Connect the appropriate (special tool #9977-6-1, Adapter) or (special tool #9977-6-3, Adapter) to the Antenna cable at the back of the EAM.
- Connect the appropriate (special tool #9977-6-4, Jumper) or (special tool #9977-6-2, Jumper) to the Antenna cable at the Antenna base.
- Measure the Resistance across the tool terminals.
Is the resistance above 52.5 Ohms?
Yes
- Use the (special tool #9977-6, Kit, Radio Antenna Diagnostic) to locate the open circuit, repair or replace the Antenna cable as necessary.
- Once the repair is complete clear all DTCs.
- Perform the BODY VERIFICATION TEST. Refer to BODY VERIFICATION TEST .
No
- Replace the Antenna base in accordance with the Service Information.
- Once the repair is complete clear all DTCs.
- Perform the BODY VERIFICATION TEST. Refer to BODY VERIFICATION TEST .
- GLOBAL TELEMATICS BOX MODULE (TBM2)
- Visually inspect the terminals on the TBM2.
- Ensure the terminal is clean and free of any corrosion or damage.
- Is the terminal free of corrosion and damage?
Yes
- Replace the TBM2 in accordance with the service information. Refer to MODULE, GLOBAL TELEMATICS BOX, REMOVAL AND INSTALLATION .
- Perform the BODY VERIFICATION TEST. Refer to BODY VERIFICATION TEST .
No
- Repair the terminal as necessary.
- Perform the BODY VERIFICATION TEST. Refer to BODY VERIFICATION TEST .
NO RELATED
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.