Pinpoint Test E: One Or More Illumination Source Is Inoperative
Instrument Cluster and Panel Illumination
Pinpoint Test E: One Or More Illumination Source Is Inoperative
Normal Operation
The Body Control Module (BCM) sends voltage to the dimmable components.
For the base Audio Control Module (ACM) (AM/FM only), the BCM (Body Control Module) supplies voltage to the ACM (Audio Control Module) illumination based on the Steering Column Control Module (SCCM) illumination messages sent to the BCM (Body Control Module) over the network.
For all other ACMs (Audio Control Modules), the BCM (Body Control Module) sends a message to the ACM (Audio Control Module) over the Medium Speed Controller Area Network (MS-CAN) based on input from the instrument panel dimmer switch.
When the accessory delay relay energizes, voltage is provided to the non-dimmable switches.
This pinpoint test is intended to diagnose the following:
- Wiring, terminals or connectors
- ACM (Audio Control Module)
- Door lock control switch
- Illuminated switch
PINPOINT TEST E : ONE OR MORE ILLUMINATION SOURCE IS INOPERATIVE
NOTICE: Use the correct probe adapter(s) when making measurements. Failure to use the correct probe adapter(s) may damage the connector.
E1 CHECK THE VOLTAGE TO THE SINGLE ILLUMINATION
NOTE: If the instrument panel dimmer switch illumination is the inoperative source, increase the backlighting brightness to the highest setting before unplugging the instrument panel dimmer switch connector.
- Ignition OFF.
- Disconnect: Inoperative Illumination Source.
- Ignition ON.
- NOTE: If the headlamp switch illumination is the inoperative source, unplugging the headlamp switch connector causes the BCM (Body Control Module) to turn the exterior lights on by default, so there is no need to turn the parking lamps on.
Place the headlamp switch to the PARKING LAMPS ON position.
- Increase the backlighting brightness to the highest setting.
- Measure the voltage between the inoperative illumination source, harness side and ground as follows:
Component Connector-Pin Circuit Ambient lighting Switch C3348-3 VLN04 (VT/GY) ACM (Audio Control Module) (base radio only) C290A-3 VLN04 (VT/GY) Floor shifter C3245-4 VLN04 (VT/GY) Hazard/PAD (Passenger Air Bag Deactivation) /traction control switch C2355-6 VLN04 (VT/GY) Headlamp switch C205-1 VLN04 (VT/GY) Hill descent control switch (Raptor only) C3394-3 VLN04 (VT/GY) Instrument panel dimmer switch C2298-1 VLN04 (VT/GY) Mode select switch C284-4 VLN04 (VT/GY) Off-road mode switch (Raptor only) C3393-3 VLN04 (VT/GY) Overhead console (roof opening panel/power sliding window) C912-2 VLN04 (VT/GY) Upfitter switch C3389-2 VLN04 (VT/GY) LH rear heated seat switch C731-2 CBP32 (GN/VT) RH rear heated seat switch C831-2 CBP32 (GN/VT) LH door lock control switch C505-1 CBP32 (GN/VT) RH door lock control switch C605-1 CBP32 (GN/VT)
Is the voltage greater than 10 volts?
Yes
For a door lock control switch, INSTALL a new door lock control switch. TEST the system for normal operation.
For rear heated seat switch, INSTALL a new rear heated seat switch.
For an instrument panel dimmer switch, INSTALL a new instrument panel dimmer switch. REFER to Instrument Panel Dimmer Switch . TEST the system for normal operation.
For all other components, GO to E2.
No
REPAIR circuit VLN04 (VT/GY) or circuit CBP32 (GN/VT) for an open. TEST the system for normal operation.
E2 CHECK THE GROUND CIRCUIT TO THE ILLUMINATION SOURCE FOR CONTINUITY
- Measure the voltage between the inoperative illumination source pins, harness side as follows:
Component Connector-Pin/ Circuit Connector-Pin/ Circuit Ambient lighting switch C3348-3 VLN04 (VT/GY) C3348-4 GD133 (BK) ACM (Audio Control Module) (base radio only) C290A-3 VLN04 (VT/GY) C290A-4 GD114 (BK/BU) Floor shifter C3245-4 VLN04 (VT/GY) C3245-5 GD138 (BK/WH) Hazard/PAD (Passenger Air Bag Deactivation) /traction control switch C2355-6 VLN04 (VT/GY) C2355-1 GD133 (BK) Headlamp switch C205-1 VLN04 (VT/GY) C205-8 GD133 (BK) Hill descent switch (Raptor only) C3394-3 VLN04 (VT/GY) C3394-2 GD138 (BK/WH) Mode select switch C284-4 VLN04 (VT/GY) C284-1 GD133 (BK) Off-road mode switch (Raptor only) C3393-3 VLN04 (VT/GY) C3393-2 GD138 (BK/WH) Overhead console (roof opening panel/power sliding window) C912-2 VLN04 (VT/GY) C912-12 CPR39 (VT/WH) Upfitter switch C3389-2 VLN04 (VT/GY) C3389-3 GD138 (BK/WH)
Is the voltage greater than 10 volts?
Yes
INSTALL a new component in question. TEST the system for normal operation.
No
REPAIR the ground circuit in question for an open. TEST the system for normal operation.