Safari Van M V6-262 4.3L VIN Z TBI (1990)
Combination Switch: Technical Service Bulletins
Cruise Control - Works Intermittently
GMC NUMBER: 92-8A-89
GROUP: 8A Cab Electrical
DATE: May 1992
CORPORATE
NUMBER: 268102
SUBJECT:
CRUISE CONTROL WORKS INTERMITTENTLY
MODELS:
1985-92 M/L VEHICLES OR 1986-92 S/T VEHICLES WITH CRUISE CONTROL (RPO K34)
Some owners of 1985-92 M/L vehicles or 1986-92 S/T vehicles with cruise control (RPO K34) may comment that their cruise control operates
intermittently. This condition may be caused by the wires becoming pinched as they exit the multi-functional lever. These wires may ground out on the
lever rod and short the cruise function. To correct this condition in production, the wiring harness that exits the lever has been rerouted and the opening
in the multi-functional lever has been redesigned to allow the wires more clearance. The diagnostic procedures in the applicable Service Manual should
be followed before replacing the multi-functional lever. If the multi-functional lever requires replacement, the following procedure should be performed:
SERVICE PROCEDURE
1.
Disconnect the wire harness connector.
2.
Remove the harness protector cover.
3.
Attach a long piece of mechanic's wire to the end of the harness connector.
4.
Remove the multi-functional lever from the turn signal switch.
5.
Gently pull the harness up and out so the mechanic's wire can be used to install the new unit.
6.
Attach the upper end of the mechanic's wire to the harness connector. Gently pull the mechanic's wire at the lower end of the column, feeding the
harness into the proper location in the column.
7.
Install a redesigned multi-functional lever (P/N 25111290) into the turn signal switch.
8.
Disconnect the mechanic's wire from the harness connector.
9.
Install the harness protector cover.
10.
Reconnect the wire harness connector.
SERVICE PARTS INFORMATION
Part Number
Descrption
25111290
Multi-functional Lever
Important
The new Part Number (P/N 25111290) should be used when correcting this conditon in the above listed vehicles.