Circuit Description
Ground is applied to the turn signal switch. When the turn signal switch is placed in the turn right position, ground is applied to the body control module (BCM) through the right turn signal switch circuit. The BCM applies a pulsating voltage to the RF and RR turn signal lamps through the RF and RR turn signal voltage supply circuits.
Conditions for Running the DTC
The battery voltage must be between 9.0-16 volts.
Conditions for Setting the DTC
A short to ground or an open in the RF turn signal voltage supply circuit is present for longer then 0.1 seconds.
Action Taken When the DTC Sets
The right front turn signal lamp does not work.
Conditions for Clearing the DTC
| • | The DTC will clear on current status after the condition for setting the fault is corrected. |
| • | Will set a history code which will clear after 100 consecutive ignition cycles without a fault present. |
| • | History and current DTCs can be cleared using a scan tool. |
Diagnostic Aids
| • | Check the RF turn lamp bulb. If the bulb is open, DTC B3948 will be set. |
| • | If the DTC is a history DTC, the fault may be interment. Refer to Testing for Intermittent Conditions and Poor Connections in Wiring Systems. |
| • | An interment short to ground or an open in the following locations may cause an intermittent malfunction to occur: |
| - | The BCM |
| - | The underhood electrical center |
| - | The right front turn signal supply voltage circuit |
Step | Action | Yes | No |
|---|---|---|---|
Schematic Reference: Exterior Lights Schematics Connector End View Reference: Master Electrical Component List in Wiring Systems | |||
1 | Did you perform the Lighting System Diagnostic System Check? | Go to Step 2 | |
2 |
Do the front right turn signal lamps flash on and off? | Go to Testing for Intermittent Conditions and Poor Connections in Wiring Systems | Go to Step 3 |
3 |
Does the test lamp illuminate? | Go to Step 4 | Go to Step 5 |
4 | Test the RF turn signal voltage supply circuit for a short to ground. Refer to Circuit Testing and to Wiring Repairs in Wiring Systems. Did you find and correct the condition? | Go to Step 12 | Go to Step 8 |
5 | Test continuity in the LF turn signal voltage supply circuit between the BCM harness connector C1 and the LF turn signal lamp. Refer to Circuit Testing in Wiring Systems. Is there continuity in the circuit? | Go to Step 9 | Go to Step 6 |
6 |
Did you find and correct the condition? | Go to Step 12 | Go to Step 7 |
7 |
Did you find and correct the condition? | Go to Step 12 | Go to Step 8 |
8 | Inspect for a high resistance or an open at the harness connector of the underhood electrical center. 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 or an open at the harness connector of the BCM. 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 underhood electrical center. Refer to Underhood Electrical Center or Junction Block Replacement in Wiring Systems. Did you complete the replacement? | Go to Step 12 | -- |
11 |
Important: After replacing the BCM, perform the setup procedure. Refer to Body Control Module (BCM) Programming/RPO Configuration in Body Control System. 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 |
