GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Cadillac 🢒 2007 🢒 XLR 🢒 Driver Information and Entertainment 🢒 Cellular, Entertainment, and Navigation 🢒 DTC B3602

Circuit Description

The folding top control (FTC) module checks the integrity of the signal circuits from the folding top control switch at least once every 300 milliseconds. The folding top control switch has a constant battery positive voltage supplied. Pressing the folding top control switch to the open or close position will apply the battery positive voltage to the folding top control switch open or close signal circuit to the FTC module. The FTC module monitors the signal request to control direction movement of the folding top.

DTC Descriptor

This diagnostic procedure supports the following DTC:

DTC B3602 Convertible Top Switch

Conditions for Running the DTC

The battery voltage is between 9-16 volts.

Conditions for Setting the DTC
    • When the FTC module detects inputs on both the FTC switch open and close signal circuits at the same time.
    • When the FTC module detects either of the FTC switch open or close signal circuits active for 3 minutes or more.

Action Taken When the DTC Sets
    • Stores a current and history DTC B3602 in the FTC module.
    • The folding top operation is suspended.

Conditions for Clearing the DTC
    • This DTC will clear on the current status after the condition for setting the fault is corrected.
    • A history DTC will clear after 50 consecutive ignition cycles without a fault present.
    • History and current DTC can be cleared using the scan tool.

Diagnostic Aids

If the DTC does not reset after the code is cleared, then the switch may be the intermittent fault. Refer to Testing for Intermittent Conditions and Poor Connections .

Step

Action

Yes

No

Schematic Reference: Folding Top Schematics

Connector End View Reference: Power and Grounding Connector End Views

1

Did you perform the Diagnostic System Check - Vehicle?

Go to Step 2

Go to Diagnostic System Check - Vehicle

2

  1. Install a scan tool.
  2. Turn ON the ignition, with the engine OFF.
  3. With a scan tool, observe the Top Control Switch parameter in the data list for the folding top control (FTC) module.

Does the scan tool display Idle?

Go to Step 3

Go to Step 4

3

  1. Activate the FTC switch.
  2. With the scan tool, observe the Top Control Switch parameter.

Does the Top Control Switch parameter change state?

Go to Diagnostic Aids

Go to Step 4

4

  1. Turn OFF the ignition.
  2. Disconnect the FTC switch.
  3. Turn ON the ignition, with the engine OFF.
  4. With a scan tool, observe the Top Control Switch parameter.

Does the scan tool display Idle?

Go to Step 7

Go to Step 5

5

Test both, open and close signal circuits of the folding top control switch for a short to voltage. Refer to Circuit Testing and to Wiring Repairs .

Did you find and correct the condition?

Go to Step 10

Go to Step 6

6

Inspect for poor connections at the harness connector of the FTC. Refer to Testing for Intermittent Conditions and Poor Connections and to Connector Repairs .

Did you find and correct the condition?

Go to Step 10

Go to Step 8

7

Inspect for poor connections at the harness connector of the FTC switch. Refer to Testing for Intermittent Conditions and Poor Connections and to Connector Repairs .

Did you find and correct the condition?

Go to Step 10

Go to Step 9

8

Replace the FTC module. Refer to Control Module References for replacement, setup, and programming.

Did you complete the replacement?

Go to Step 10

--

9

Replace the FTC switch. Refer to Convertible Top Switch Replacement .

Did you complete the replacement?

Go to Step 10

--

10
  1. Use the scan tool in order to clear the DTCs.
  2. Operate the vehicle within the Conditions for Running the DTC.

Does the DTC reset?

Go to Step 2

System OK