GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Cadillac 🢒 1998 🢒 DeVille 🢒 DTC 🢒 DTC B1910 Generator L-Terminal Open Circuit

Circuit Description

This test is performed with the ignition switch in RUN, the engine speed less than 400 RPM, and the vehicle diagnosic system not activated. This DTC indicates an open circuit in the Generator L-Terminal feedback circuit. The generator grounds CKT 225 when the engine speed is less than 400 RPM and the ignition switch is in RUN.

DTC Will Set When:

Then IPC measures engine speed less than 400 RPM and determines that the L-Terminal circuit is open by sensing a high voltage condition at terminal A9.

Step

Action

Value(s)

Yes

No

1

Did you perform the Diagnostic System Check?

--

Go to Step 2

Go to Diagnostic System Check - Instrument Cluster

2
  1. Connect a Scan Tool scan tool to the Data Link Connector (DLC).
  2. View the IPC Data List Input ALT L TERMINAL on the scan tool.

Does the scan tool display ON?

--

Go to Step 5

Go to Step 3

3
  1. Ignition switch OFF.
  2. Disconnect the IPC connector C1.
  3. Disconnect the generator.
  4. Connect a J 39200 digital multimeter (DMM) from the IPC connector C1 terminal A9 to generator terminal L.

Is the resistance within the specified range?

1-5 ohms

Go to Charging System Check

Go to Step 6

4
  1. Connect IPC connector C1.
  2. Place the ignition switch in RUN.
  3. Connect the DMM from generator terminal L to ground.

Is the voltage within the specified range?

10-15 ohms

 

Go to Step 5

5

Replace the IPC. Refer to Instrument Cluster Replacement .

Is the replacement complete?

--

Go to Diagnostic System Check - Instrument Cluster

--

6

Repair an open in CKT 225 (RED). Refer to Wiring Repairs in Wiring Systems.

Is the repair complete?

--

Go to Diagnostic System Check - Instrument Cluster

--