Riviera V6-3.8L SC VIN 1 (1995)
A.
Disconnect the left-hand coolant fan connector.
B.
Using a J39200 digital voltmeter or equivalent, perform the following check.
-
Set the meter to the diode scale.
-
Measure across the two pins on the body harness side of the left-hand coolant fan connector. Check one direction, then reverse the leads
and check in the opposite direction.
-
It the surge protection diode is present and good, one direction shows overload (OL); the other direction shows about 0.5 volt.
Note:
The procedure in Step 4 may be used to verify that the diode in an installed jumper harness is good.
Installation - Buick Riviera
Install jumper harness and replace EBCM/EBTCM as follows:
1.
Disconnect negative battery cable.
2.
Disconnect left-hand coolant fan motor connector.
3.
Install jumper harness, P/N 12165487, on connector of left-hand coolant fan motor (1). See Figure 1.
4.
Position jumper harness on fan at fan web as shown in Figure 1. Install wire tie around jumper harness and fan web using existing fan web hole
(2). Position wire tie so that it is offset from the center of the harness, providing a more secure fit. Cut off excess wire tie strap.
5.
Connect jumper harness connector (3) to main body harness.
6.
Replace EBCM/EBTCM using On-Vehicle Service procedures in Section 5E2 of the Service Manual.
7.
Reconnect negative battery cable.
Inspection - Oldsmobile Aurora
Before installing a jumper harness, perform the following inspection/test procedure.
1.
Raise vehicle on hoist.
2.
Remove lower air deflector from vehicle in area under coolant fans. To do so, remove 11 push-in retainers which secure air deflector to vehicle
underbody. (Refer to Service Manual, Section 10, Paragraph 2-3, Engine Splash Shield Replacement).
3.
Locate left-hand (primary) coolant fan connector. For Aurora, it is on a pigtail harness several inches from the fan.
4.
Perform Steps 2, 3 and 4 in above "Inspection - Buick Riviera" procedure.
Installation - Oldsmobile Aurora
