Circuit Description
The body control module (BCM) uses a varying voltage signal from the IP dimmer switch in order to determine the rate of pulse width modulation of the control circuit of the illumination lamps. The pulse width modulation rate determines the brightness of the illumination lamps.
Conditions for Running the DTC
Voltage supplied to the module is in the normal operating range (approximately 10-16 volts).
Conditions for Setting the DTC
| • | The BCM detects one of the following conditions: |
| - | A short to voltage in the 12-volt reference circuit of the IP dimmer switch. |
| - | A short to voltage in the dimming circuit of the IP dimmer switch. |
| - | An open in the low reference circuit of the IP dimmer switch. |
| • | The condition is present for longer than 1.0 second. |
Action Taken When the DTC Sets
| • | The BCM stores DTC B2613 in memory. |
| • | The illumination lamps remain at full brightness until the code is cleared. |
Conditions for Clearing the MIL/DTC
| • | A current DTC B2613 clears when the BCM no longer detects one of the above conditions. |
| • | A history DTC B2613 clears after 100 consecutive ignition cycles. |
| • | The BCM receives the Clear Code commend from the scan tool. |
Diagnostic Aids
| • | If the DTC B2613 is a history DTC, the fault may be intermittent. Refer to Testing for Intermittent Conditions and Poor Connections in Wiring Systems. |
| • | An intermittent condition in the following locations may cause an intermittent malfunction to occur: |
| - | The 12-volt reference circuit of the IP dimmer switch, the signal circuit of the IP dimmer switch, or the low reference circuit of the IP dimmer switch |
| - | The IP dimmer switch |
| - | The BCM |
Step | Action | Value(s) | Yes | No |
|---|---|---|---|---|
Schematic Reference: Interior Lights Dimming Schematics Connector End View Reference: Master Electrical Component List | ||||
1 | Did you perform the Diagnostic System Check? | -- | Go to Step 2 | |
2 |
Does the scan tool indicate that the dimming switch parameter is within the specified range? | 2.0-6.0 V | Go to Diagnostic Aids | Go to Step 3 |
3 |
Does the scan tool indicate that the dimming switch parameter is greater than the specified value? | 6.0 V | Go to Step 4 | Go to Step 7 |
4 | Test the 12-volt reference circuit of the IP dimmer switch for a short to voltage. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you find and correct the condition? | -- | Go to Step 12 | Go to Step 5 |
5 | Test the signal circuit of the IP dimmer switch for a high resistance or an open. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you find and correct the condition? | -- | Go to Step 12 | Go to Step 6 |
6 | Test the signal circuit of the IP dimmer switch for a short to voltage. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you find and correct the condition? | -- | Go to Step 12 | Go to Step 9 |
7 |
Did you find and correct the condition? | -- | Go to Step 12 | Go to Step 8 |
8 | Inspect for a high resistance at the harness connector of the IP dimmer switch. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems. Did you find and correct the condition? | -- | Go to Step 12 | Go to Step 10 |
9 | Inspect for a high resistance at the harness connector of the body control module. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems. Did you find and correct the condition? | -- | Go to Step 12 | Go to Step 11 |
10 | Replace the IP dimmer switch. Refer to Headlamp Switch Replacement . Did you complete the replacement? | -- | Go to Step 12 | -- |
11 |
Important: Perform the set up procedure for the body control module (BCM). Refer to Body Control Module (BCM) Programming/RPO Configuration in Body Control Systems. Replace the BCM. Refer to Body Control Module Replacement in Body Control System. Did you complete the replacement? | -- | Go to Step 12 | -- |
12 |
Does the DTC reset? | -- | Go to Step 2 | System OK |
