Friday, April 12, 2019

2019 Cadillac Truck Escalade AWD V8-6.2L Diagnostic Instructions Page 549


* Testing for Intermittent Conditions and Poor Connections (See: Testing and Inspection/Component Tests and General Diagnostics/General



Electrical Diagnostic Procedures/Circuit Testing/Testing for Intermittent Conditions and Poor Connections)



* Wiring Repairs (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic Procedures/Wiring



Repairs/Wiring Repairs)



Scan Tool Reference



Control Module References (See: Testing and Inspection/Programming and Relearning) for scan tool information



Circuit/System Testing



1. Ignition OFF, disconnect the harness connector at the A10 inside rearview mirror.



2. Test for less than 10 Ohms between the mirror ground circuit terminal 8 and ground.



锟斤拷 If greater than the specified range, test the ground circuit for an open/high resistance.



3. Ignition ON, test for less than 1 V between the keypad signal circuit terminal 11 and ground.



锟斤拷 If greater than the specified range, test the keypad signal circuit for a short to voltage. If the circuit tests normal, replace the CIM.



4. Ignition OFF, test for 600k-800k Ohms between the keypad signal circuit terminal 11 and ground.



锟斤拷 If less than the specified range, test the keypad signal circuit for a short to ground. If the circuit tests normal, replace the CIM.



锟斤拷 If greater than the specified range, test the keypad signal circuit for an open/high resistance. If the circuit tests normal, replace the CIM.



5. Ignition ON, test for 9.5-10.5 V between the keypad supply voltage circuit terminal 12 and ground.



锟斤拷 If less than the specified range, test the supply voltage circuit for a short to ground or open/high resistance. If the circuit tests normal,



replace the CIM.



锟斤拷 If greater than the specified range, test the supply voltage circuit for a short to voltage. If the circuit tests normal, replace the CIM.



6. If all circuits test normal, test or replace the button assembly.



Repair Instructions



Perform the Diagnostic Repair Verification (See: Verification Tests) after completing the diagnostic procedure.



* Inside Rearview Mirror Replacement (See: Body and Frame/Mirrors/Service and Repair/Inside Rearview Mirror Replacement)



* Control Module References (See: Testing and Inspection/Programming and Relearning) for CIM replacement, setup, and programming



B2485



DTC B2485



Diagnostic Instructions



* Perform the Diagnostic System Check - Vehicle (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic System



Check - Vehicle) prior to using this diagnostic procedure.



* Review Strategy Based Diagnosis (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Strategy Based Diagnosis) for an



overview of the diagnostic approach.



* Diagnostic Procedure Instructions (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic Procedure



Instructions) provide an overview of each diagnostic category.



DTC Descriptors



DTC B2485 02



- Wireless Communication Antenna Circuit Short to Ground



DTC B2485 04



- Wireless Communication Antenna Circuit Open Circuit



Circuit/System Description



The Bluetooth (R) antenna is a small fixed antenna connected directly to the communication interface module (CIM) and is used to send and receive



signals from a Bluetooth (R) enabled cellular phone. The antenna utilizes no cabling and is not external to the vehicle.



Conditions for Running the DTC



* Ignition ON.



* Battery voltage must be between 9-16 V.

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