Body Switches (With Backlighting) - Replacements
88buick20Bulletin: 86-8-19
Date: Sept. '88
Ref. No.: 86-219-8
Corp. Ref. No.: 618209R
SUBJECT: HEADLAMP, WIPER, SEAT, MIRROR AND WINDOW SWITCHES, AND ELECTROLUMINESCENT INVERTERS
MODELS AFFECTED: 1986 BUICK RIVIERA
Some 1986 Riviera service replacement body switches with electroluminescent backlighting have been unavailable or difficult to obtain due to short supply. Service part supplies have been replenished and these switches are now available through GM Service Parts Operations (GMSPO) using the following part numbers:
1986 1986 1987
Old P/N New P/N P/N Description
25525943 1645493 1640028 Headlamp Switch With Twilight
Sentinel
25525944 1645494 1640029 Headlamp Switch w/o Twilight
Sentinel
25525945 1645495 1640834 Windshield Wiper Switch
w/Rear Defog
25525946 1645496 1642271 Windshield Wiper Switch w/o
Rear Defog
1636498 1636498 1642275 Electro-luminescent Inverter
for Headlamp & Wiper Switches
20645520 1645508 20676242 Six-way Passenger Seat Switch
70645521 1645509 20676243 Six-way Driver Seat switch
20625421 20625421 1642276 Electro-luminescent Inverter
for Seat Switch
20693949 1645511 20676244 Remote Outside mirror Switch
20463712 1645510 20676245 Two-button Window Switch
Mounted on Console
1636499 1636499 1642274 Electro-luminescent Inverter
for Mirror and Window Switches
When servicing a 1986 Riviera, perform the following checks before replacing a switch or inverter:
1. Check the last three digits of the seven or eight digit numerical part number stamped on the switch or inverter being replaced. Some 1986 Rivieras may have been serviced in the past with 1987 model parts because of 1986 switch shortages.
2. If the last three digits of the part number stamped on the switch or inverter match the last three digits of the 1987 part number listed in this bulletin, replace the switch or inverter with the 1987 style part. Be careful when checking the last three digits of the stamped part number. In some cases, the leading digits are physically stamped into the part while the trailing digits are stamped in ink. In other cases, the leading digits and trailing digits are physically stamped into the part; but the trailing digit(s) were stamped separately, and thus appear slightly offset from the leading digits. Find and check the seven or eight digit numerical part number.
3. After installation, check the switch backlighting intensity. If the switch backlighting is too bright or too dim compared to the other backlit components, check the last three digits of the part number stamped on the affected switch and its inverter.
4. The last three digits of the part number on the switch and inverter should indicate that both are 1986 part numbers or both are 1987 part numbers as listed in this bulletin. 1986 switches are not compatible with 1987 invertors and vice-versa.
For inverter location and switch backlighting diagnosis, see Section 8A-88 of the appropriate Buick Service Information Manual.