GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Cadillac 🢒 2002 🢒 Eldorado 🢒 Body and Accessories 🢒 Body Control System 🢒 DTC B1552

Circuit Description

The body control module (BCM) contains a data storage area which can save pertinent data when the ignition is turned OFF. The keep alive memory (KAM) data is lost if battery power is removed from the BCM.

Conditions for Setting the DTC

DTC B1552 indicates that the keep alive memory (KAM) has been reset. This is a normal occurrence whenever power or ground is removed from the BCM, such as during a battery disconnect.

Action Taken

The BCM memory is reset to the initial values. The BCM sets the following defaults:

    • Fuel Level: Empty
    • Afterblow Mode: Disable
    • Afterblow Alarm: Disable
    • Controlled Power Timer: Set to Full Time
    • Power Down Hours: Clear
    • Storage Mode State: Disable
    • Key Cylinder State: Inactive
    • Driver Door Jamb: Closed
    • Other Doors Jamb: Closed
    • Ignition State: Current State

Conditions for Clearing the DTC
    • A current DTC clears when the malfunction is no longer present.
    • A history DTC clears when the module ignition cycle counter reaches the reset threshold, without a repeat of the malfunction.

Diagnostic Aids

If DTC B1552 sets without a battery disconnect, inspect the terminal contacts at BCM connector.

  1. This step verifies the BCM voltage supply circuits.

    2.

  2. The step verifies the BCM ground circuits.

Step

Action

Yes

No

Schematic Reference: Body Control Module Schematics

1

Did you perform the Diagnostic System Check for the system exhibiting the symptom?

Go to Step 2

Go to Control Module References for the applicable Diagnostic System Check

2

  1. Turn ON the ignition switch.
  2. Clear any DTCs.
  3. Turn OFF the ignition switch.
  4. Turn ON the ignition switch.

Is the DTC still present?

Go to Step 3

Go to Testing for Intermittent and Poor Connectionsin Wiring Systems

3

Test the ignition positive and the battery positive voltage circuits to the BCM for an open or short to ground refer to Circuit Testing and Wiring Repairsin Wiring Systems.

Did you find and correct the condition?

System OK

Go to Step 4

4

Test the ground circuits to the BCM for an open refer to Circuit Testing and Wiring Repairsin Wiring Systems.

Did you find and correct the condition?

System OK

Go to Step 5

5

Inspect for poor connections at the harness connector of the BCM. Refer to Testing for Intermittent and Poor Connections and Connector Repairs in Wiring Systems.

Did you find and correct the condition?

System OK

Go to Step 6

6

Replace the BCM. Refer to Body Control Module Replacement.

Is the repair complete?

System OK

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