Mobile Device Wireless Charger Malfunction

Diagnostic Instructions Perform the Diagnostic System Check prior to using this diagnostic procedure: Diagnostic System Check - Vehicle Review the description of Strategy Based Diagnosis: Strategy Based Diagnosis An overview of each diagnostic category can be found here: Diagnostic Procedure Instructions Diagnostic Fault Information

Circuit Number	Circuit Description	Short to Ground	Open/High Resistance	Short to Voltage	Signal Performanc
40	Ignition	1	1	—	—
4984	Serial Data	U0146, U0184, U0257, U0422, U0447	U0146, U0184, U0257, U0422, U0447	U0146, U0184, U0257, U0422, U0447	—
4985	Serial Data	U0146, U0184, U0257, U0422, U0447	U0146, U0184, U0257, U0422, U0447	U0146, U0184, U0257, U0422, U0447	—
1450	Ground	—	1	—	—
1. T22 Wireless Accessory Charging Module = Inoperative

Circuit/System Description The T22 Wireless Accessory Charging Module is controlled by an ignition operated relay and is operational when the ignition is in the Accessory or ON position. When a wireless charging device is placed on the charging pad/pocket the charging of the device battery will start (pictures of proper placement instructions can be found in owners manual). The K9 Body Control Module detects the device battery is charging and sends a serial data message to the P17 Info Display Module which illuminates the charge indicator. Diagnostic Aids Verify the mobile device can be charged with the proper wireless charging adapter. To check for phone or other device compatibility, refer to GM Total Connect website. Verify the mobile device is running the latest operating system and does not have any pending updates. Rebooting the customer’s phone may help. Verify the charging pad/pocket is free from debris or any obstruction that may impede charging. The T22 Wireless Accessory Charging Module contains an internal temperature switch that will open if it exceeds 85°C (185°F). The ambient operating temperature is between -20 and 60°C (-4 and 140°F) for the charging system and between 0 and 35°C (32 and 95°F) for the mobile device. If the mobile device temperature exceeds 35°C (95°F) the mobile device may stop accepting a charge (this may vary with different mobile devices). A text message will be displayed on the radio indicating that the system is unable to charge due to high temperature while the charger or the phone is above or below these operating temperature ranges. Verify the mobile device is positioned correctly on the charging pad/pocket and there are no foreign objects between the mat and the mobile device. It may be necessary to move the device around slightly or rotate 180 degrees to properly align it on the charging pad/pocket until the device starts to charge. The use of a protective case may require more precise device placement to allow charging or may inhibit charging. Try removing the protective case. The mobile device may not charge if the charge mat is NOT completely flat or has an air gap which can be verified by a finger push at the target graphic located at the center of the mat. If the charge mat is NOT flat, replace the charge mat/rubber liner. While operating the vehicle in rough conditions, it is possible for the device to move out of position, repositioning of the device may be necessary. If the mobile device battery is fully charged, the charge indicator on the P17 Info Display Module may not illuminate. Reference Information Schematic Reference Cigar Lighter/Power Outlet Schematics Connector End View Reference Master Electrical Component List Description and Operation Mobile Device Wireless Charger Description and Operation Electrical Information Reference Circuit Testing Connector Repairs Testing for Intermittent Conditions and Poor Connections Wiring Repairs Special Tools EL-51755 Inductive Charging Test Tool Equivalent regional tools: Special Tools Circuit/System Verification

Warning

Remove all objects from the charging pad before charging your mobile device. Objects, such as coins, keys, rings, paper clips, or cards, between the phone and charging pad will become very hot. On the rare occasion that the charging system does not detect an object, and the object gets wedged between the phone and charger, remove the phone and allow the object to cool before removing it from the charging pad, to prevent burns.

1. Ignition ON.
2. Verify there are no communication DTCs set. ⇒ If there are DTCs set Refer to: Diagnostic Trouble Code (DTC) List - Vehicle ⇓ If there are no DTCs set

Note

There is a charging coil located in the center of the Charging Pad/Pocket. The EL-51755 Inductive Charging Test Tool has a charging coil in the center of the tool. These coils must be aligned in order for the test tool to illuminate. To complete successfully, the procedure may need to be repeated 5 times. Between each attempt, remove the tool and wait 2 s.

3. Install the special tool: EL-51755–UPD Adapter fitted to the EL-51755 Inductive Charging Test Tool on the Charging Pad/Pocket, keeping it centered.
4. Verify the Special Tools LED is on. ⇒ If the LED is off Refer to: Circuit/System Testing ⇓ If the LED is on

Note

The customer’s device may not be compatible or is defective.

5. A fault is not currently present and may be an intermittent condition. Circuit/System Testing

Note

It may take up to 2 min for all vehicles systems to power down before an accurate ground or low reference circuit continuity test can be performed.

1. Ignition OFF, disconnect the connector at the T22 Wireless Accessory Charging Module.
2. Verify a test lamp illuminates between ground circuit terminal 2 and B+. Ground circuit terminal 2 & Ground ⇒ If the test lamp does not illuminate Repair the open/high resistance in circuit 1450 or ground connection. ⇓ If the test lamp illuminates
3. Ignition ON
4. Verify a test lamp illuminates between B+ circuit terminal 40 and ground. ⇒ If the test lamp does not turn on and the circuit fuse is OK 4.1. Test circuit 40 for an open/high resistance. ⇒ If an open/high resistance is found, repair the fault on the circuit. ⇓ If an open/high resistance is not found. Refer to: Retained Accessory Power Malfunction ⇒ If the test lamp does not turn On and the circuit fuse is open 4.1. Test circuit 40 for a short to ground. ⇒ If a short to ground is found, repair the fault on the circuit. ⇓ If a short to ground is not found. 4.2. Replace the T22 Wireless Accessory Charging Module. ⇓ If the test lamp turns On
5. Test or replace the component: T22 Wireless Accessory Charging Module Repair Instructions Perform the Diagnostic Repair Verification after completing the repair: Diagnostic Repair Verification Wireless Charging System Module Replacement — T22 Wireless Accessory Charging Module