For wiring diagrams, refer to
Cell 51: DTC B2617, B2618 -- Courtesy Lamp Circuit
in Body Control System Schematics.
Circuit Description
The BCM monitors the voltage and controls the ground of the courtesy lamp relay on CKT 690. The BCM will ground the relay and turn ON the courtesy lamps if any of the following conditions exists:
| • | The BCM receives a signal from a mini-wedge door jamb switch. |
| • | The BCM receives an RFA signal to unlock the doors from the remote door lock receiver module. |
| • | The dome lamp switch is turned ON. |
The BCM will set DTC B2617 if the following conditions exist:
| • | CKT 690 is open or shorted to ground. |
| • | The BCM is not receiving a signal to turn ON the courtesy lamps. |
Conditions for Setting the DTC
| • | All of the courtesy lamps are displayed as INACTIVE on the scan tool and the courtesy lamps are OFF. |
| • | CKT 690 is open or shorted to ground. |
| • | The system voltage is between 9.0-16.0 volts. |
| • | All of the above conditions exist for 0.5 seconds. |
Action Taken When the DTC Sets
| • | The courtesy lights will not function if the circuit is open. |
| • | The courtesy lights will be ON at all times if the circuit is shorted to ground. |
Conditions for Clearing the MIL/DTC
| • | A current DTC will clear immediately after the condition that sets the DTC is corrected. |
| • | A history DTC will clear after 100 consecutive ignition cycles without a fault present. |
| • | History and current DTCs can be cleared using a scan tool. |
Diagnostic Aids
| Important: Use the appropriate probe from the J 35616 connector test adapter kit for any probing of the bussed electrical centers (BECs) in this table. Use of the appropriate probe prevents damage to the BECs. |
| • | Always perform the first DTC that is listed on the scan tool if more than one is displayed. |
| • | Verify that the scan tool displays DTC B2617 as a current code before you perform diagnostics. |
| • | Inspect for loose or poor connections at all of the related components. |
| • | Refer to Wiring Systems for intermittent and poor connections. |
Test Description
The numbers below refer to the step numbers on the diagnostic table.
-
This step determines if CKT 690 is shorted or open between the courtesy lamp relay and the BCM.
-
This step determines if one of the following conditions exists:
-
This step determines if the BCM is defective.
-
This step determines if CKT 690 is open between the BBEC and the BCM harness.
-
This step determines if one of the following conditions exists:
| • | The BCM is defective. |
| • | CKT 690 is shorted to ground. |
| • | CKT 156 is open between the BBEC and the courtesy lamp relay. |
| • | The courtesy lamp relay is defective. |
Step | Action | Value(s) | Yes | No |
|---|---|---|---|---|
1 | Was the BCM Diagnostic System Check performed? | -- | Go to Step 2 | |
2 |
Are the courtesy lamps on at all times? | -- | Go to Step 3 | Go to Step 5 |
3 |
Does the J 39200 display battery voltage? | -- | Go to Step 11 | Go to Step 4 |
4 | Locate and repair the short to ground in CKT 690 (GRY/BLK) between the BCM and the courtesy lamp relay. Is the repair complete? | -- | Go to Step 12 | -- |
5 | Use a fused jumper in order to backprobe BCM connector C2 (LT BLU) CKT 690 (GRY/BLK) cavity A3 to ground. Do the courtesy lamps turn on? | -- | Go to Step 11 | Go to Step 6 |
6 |
Is the resistance within the specified range? | 0-5 ohms | Go to Step 7 | Go to Step 10 |
7 |
Does the J 39200 display battery voltage? | -- | Go to Step 8 | Go to Step 9 |
8 | Replace the courtesy lamp relay. Is the repair complete? | -- | Go to Step 12 | -- |
9 | Replace the body bussed electrical center (BBEC). Is the repair complete? | -- | Go to Step 12 | -- |
10 | Locate and repair the open in CKT 690 (GRY/BLK) between the BCM and the courtesy lamp relay. Is the repair complete? | -- | Go to Step 12 | -- |
11 |
Is the repair complete? | -- | -- | |
12 | Clear the DTCs. Is the repair complete? | -- | -- |
