GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Buick 🢒 1999 🢒 Park Avenue 🢒 Transmission/Transaxle 🢒 Automatic Transaxle - 4T65-E 🢒 Transmission Internal Mode Switch Resistance Check

Transmission Internal Mode Switch Resistance Check (1999 C-car 4T65-E)

Step

Action

Value(s)

Yes

No

1
  1. Disconnect the automatic transmission (A/T) wiring harness assembly from the IMS.
  2. Using the J 39200 digital multimeter (DMM) and the J 35616-A connector test adapter kit, measure the resistance from each terminal to each of the other terminals and to the manual shift detent lever.

    3. Refer to the Transmission Internal Mode Switch Continuity Check Procedure.

Is each terminal Open and Closed as specified in the Transmission Internal Mode Switch Continuity Check Procedure?

--

Go to Step 2

Go to Step 8

2

Measure the resistance of the A/T wiring harness assembly from terminal F to terminals G, H, J, K and the transmission case.

Is the resistance greater than the specified value?

100 K ohms

Go to Step 3

Go to Step 7

3

Measure the resistance of the A/T wiring harness assembly from terminal G to terminals H, J, K and the transmission case.

Is the resistance greater than the specified value?

100 K ohms

Go to Step 4

Go to Step 7

4

Measure the resistance of the A/T wiring harness assembly from terminal H to terminals J, K and the transmission case.

Is the resistance greater than the specified value?

100 K ohms

Go to Step 5

Go to Step 7

5

Measure the resistance of the A/T wiring harness assembly from terminal J to terminal K and the transmission case.

Is the resistance greater than the specified value?

100 K ohms

Go to Step 6

Go to Step 7

6

Measure the resistance of the A/T wiring harness assembly from terminal K to the transmission case.

Is the resistance greater than the specified value?

100 K ohms

System OK

Go to Step 7

7

Replace the Automatic Transmission Wiring Harness Assembly.

Refer to Solenoids and Wiring Harness Replacement .

Is the replacement complete?

--

Go to Step 1

--

8

Replace the Transmission Internal Mode Switch.

Refer to Transmission Internal Mode Switch Replacement.

Is the replacement complete?

--

Go to Step 1

--

Transmission Internal Mode Switch Continuity Check Procedure

IMS Terminals

Manual Shift Detent Lever Position

P

P/R

R

R/N

N

N/D4

D4

D4/D3

D3

D3/D2

D2

D2/D1

D1

E to A

C

C

O

O

C

C

O

O

C

C

O

O

C

E to B

O

O

O

O

O

C

C

C

C

C

C

C

C

E to C

O

C

C

C

C

C

C

C

C

O

O

O

O

E to D

C

C

C

O

O

O

O

C

C

C

C

O

O

D to A

C

C

O

O

O

O

O

O

C

C

O

O

O

D to B

O

O

O

O

O

O

O

C

C

C

C

O

O

D to C

O

C

C

O

O

O

O

C

C

O

O

O

O

C to A

O

C

O

O

C

C

O

O

C

O

O

O

O

C to B

O

O

O

O

O

C

C

C

C

O

O

O

O

B to A

O

O

O

O

O

C

O

O

C

C

O

O

C

Important: Terminals A, B, C, D and E must be Open to the manual shift detent lever through all ranges.

  • C = Closed circuit
  • O = Open circuit