Brake Light Switch Inoperative, Brake Warning Buzzer Sounding and Brake Warning Light On, DTCs C0164, C0272 Set (Remove and Splice Wire/Remove CHMSL Fuse/Replace Stop Lamp Switch)

Some customers may comment that the brake light switch has become inoperative after extended usage. They may also comment that the audible brake warning buzzer is sounding and that the brake warning lamp is illuminated. Upon investigation, the technician may find DTCs C0164 and/or C0272 set.

Current flow through the stop lamp switch contacts is insufficient to allow the contacts to operate cleanly.

Increase current flow through the switch contacts by relocating a wire from the instrument panel (IP) harness using the procedure below.

1. Access the RH IP fuse block (1).
2. Drop the IP fuse block for access to the back of the fuse block.





3. Remove CKT 1740, orange wire, from cavity E7 in the IP distribution center.



4. Splice the orange wire, CKT 1740, to the wire in cavity S7 in the IP relay center at the location shown in the above schematic. Refer to Wiring Systems in SI for splicing information.
5. Remove and discard the 20A CHMSL fuse.
6. Replace the stop lamp switch with P/N 25771554. Refer to Stop Lamp Switch Replacement in SI.

For vehicles repaired under warranty, use: