These vehicles have what is called a TIPM, totally integrated power module, which is under the fuse box under the hood. What happens is this. There are several plug connections to the module all of which have very small pins. What I have been seeing happen is this. The pins, which are very thin, corrode, and either lose connection or corrode and partially break.
The result is you still have power to the component, but when a load is placed on the circuit, it can't handle the load and fails.
In this case, I don't know if there is one light, both, high or low beam issues. So I am going to give you the directions for removal of the TIPM. Once you remove it, check the plug and pins I tell you to. The attached pictures correlate with the directions.
INTEGRATED POWER MODULE
1. Disconnect the negative and positive battery cables.
2. Unsnap cover and remove the B+ terminal nut from the integrated power module B+ terminal. Remove the B+ cable from the integrated power module.
3. Disconnect the gray connector from the integrated power module.
4. Remove the integrated power module retaining bolt and screw (Fig. 2).
5. Grasp the integrated power module with two hands and slide the assembly in the direction shown (Fig. 3) to free the module from its mounting bracket. Position the assembly upside down to access the electrical connectors located on the bottom of the unit.
6. Disconnect the electrical connectors by depressing the locking tab and rotating the connector arm outboard, until the connector is free from the module assembly. Be certain to pull the connectors straight off.
7. Position the integrated power module on a bench and remove the four front control module retaining screws.
8. Disconnect the front control module by pulling it straight off the integrated power module.
1. Connect the front control module by pushing it straight on the integrated power module electrical receptacle.
2. Install the four front control module retaining screws. Torque to 30 in. Lbs. +/- 5.
NOTE: Integrated power module electrical connectors are color coded to ease location reference (Fig.4).
3. Connect the electrical connectors by pushing straight on and rotating the connector arm inboard, until the connector is firmly locked in place on the module assembly
4. Grasp the integrated power module with two hands and install the assembly on the battery tray (Fig. 5).
5. Install the integrated power module retaining bolt and screw.
6. Connect the gray connector on the integrated power module housing.
7. Install the B+ terminal cable and nut on the integrated power module B+ terminal. Snap the cover in place
8. Connect the negative and positive battery cables.
Once it is removed, carefully disconnect the black 49 pin connector, and then inspect pins
1, 2, 8, 9. If you let me know exactly what is happening, I can narrow the pins down for you. The last picture is the pin I am referring to. Note on the legend, the pins I asked you to check are for the headlights.
If the pins are damaged, they are really not repairable. The entire module needs replaced. It is a plug and play set up, but let me know so I can provide directions.
Let me know what you find or if you have other questions.
Images (Click to enlarge)
Wednesday, June 23rd, 2021 AT 3:27 PM