Daytime Running Lamps (DRL) Headlamps Inoperative Day Light Conditions
Step | Action | Value(s) | Yes | No |
|---|---|---|---|---|
DEFINITION: One or both of the front turn signal lamps do not come on in daylight conditions with DRL (Canada), or Automatic Lamp Control (if equipped). The turn signal lamps operate normally using the turn signal lever. | ||||
1 | Were you sent here from the Lighting Systems Diagnostic System Check? | -- | ||
2 | Do the headlamps, and parking lamps turn on in low light conditions? | -- | ||
3 | Do the headlamps and parking lamps turn off in daylight conditions? | -- | ||
4 | Using the scan tool special functions, command the RH DRL relay on and off. Does the RH front turn signal lamp turn on when the RH DRL relay is on? | -- | ||
5 | Using the scan tool special functions, command the LH DRL relay on and off. Does the LH front turn signal lamp turn on when the LH DRL relay is on? | -- | System OK | |
6 | Replace the RH DRL Micro Relay #38. Is the repair complete? | -- | -- | |
7 | Replace the LH DRL Micro Relay #40. Is the repair complete? | -- | -- | |
8 | Is the brake warning indicator always on? | -- | Go to Diagnostic Starting Point in Hydraulic Brakes | |
9 |
Does the scan tool indicate the parking brake switch input off and on? | -- | Go to Diagnostic Starting Point in Hydraulic Brakes | |
10 | Replace the BCM. Refer to Body Control Module Replacement and Body Control Module (BCM) Programming/RPO Configuration . Is the repair complete? | -- | -- | |
11 | Replace the ambient light sensor. Refer to Daytime Running Lamp (DRL) Ambient Light Sensor Replacement . Is the repair complete? | -- | -- | |
12 |
Did you correct the condition? | -- | System OK | |
Daytime Running Lamps (DRL) Headlamps Inoperative Low Light Conditions
Step | Action | Value(s) | Yes | No |
|---|---|---|---|---|
DEFINITION: The headlamps, or parking lamps do not come on in low light conditions, with DRL (Canada), or Automatic Lamp Control (if equipped). The headlamps, and parking lamps operate normally with the headlamp switch. | ||||
1 | Were you sent here from the Lighting Systems Diagnostic System Check? | -- | ||
2 | Do the turn signal lamps turn on in day light conditions? | -- | ||
3 | Do the turn signal lamps turn off in low light conditions? | -- | ||
4 |
Does the scan tool indicate the relay turning on and off? | -- | ||
5 | Do the headlamps turn on and off, with the scan tool indicating the ALC Headlamp Relay on and off? | -- | ||
6 | Using the scan tool command the ALC Parking Lamp Relay on and off. Does the scan tool indicate the relay turning on and off? | -- | ||
7 | Do the parking lamps turn on and off, with the scan tool indicating the ALC Parking Lamp Relay on and off? | -- | System OK | |
8 |
Is the resistance within specified values? | 50-100 ohms | ||
9 | Test and repair the ALC HDLP relay control circuit 999 for an open or high resistance if OK replace the BCM. Refer to Body Control Module Replacement and Body Control Module (BCM) Programming/RPO Configuration . Is the repair complete? | -- | -- | |
10 | Test and repair the ALC headlamp circuit 103 for an open or high resistance if OK replace the ALC HDLP Micro Relay #44. Is the repair complete? | -- | -- | |
11 |
Is the resistance within specified values? | 50-100 ohms | ||
12 | Test and repair the ALC PRK LP relay control circuit 1784 for an open or high resistance if OK replace the BCM. Refer to Body Control Module Replacement and Body Control Module Replacement . Is the repair complete? | -- | -- | |
13 | Test and repair the parking lamp feed circuit 9 for an open or high resistance between the instrument panel electrical center connector C2 terminal E6 and splice S205, if OK replace the ALC PRK LP Micro Relay #43. Is the repair complete? | -- | -- | |
14 | Replace the ALC HDLP Micro Relay #44. Is the repair complete? | -- | -- | |
15 | Replace the ALC PRK LP Micro Relay #43. Is the repair complete? | -- | -- | |
16 | Is the brake warning indicator always on? | -- | Go to Diagnostic Starting Point in Hydraulic Brakes | |
17 |
Does the scan tool indicate the parking brake switch input off and on? | -- | Go to Diagnostic Starting Point in Hydraulic Brakes | |
18 | Replace the BCM. Refer to Body Control Module Replacement and Body Control Module (BCM) Programming/RPO Configuration . Is the repair complete? | -- | -- | |
19 | Replace the ambient light sensor. Refer to Daytime Running Lamp (DRL) Ambient Light Sensor Replacement . Is the repair complete? | -- | -- | |
20 |
Did you correct the condition? | -- | System OK | |
