ESP/BAS INDICATOR
Fig. 17: Electronic Stability Program/Brake Assist System Indicator
Courtesy of CHRYSLER LLC
An Electronic Stability Program (ESP)/Brake Assist System (BAS) indicator is standard equipment on all
instrument clusters. This indicator is located near the base of the speedometer needle hub on the cluster overlay,
just right of center.
The ESP/BAS indicator consists of a stencil-like cutout of the text ESP BAS in the opaque layer of the
instrument cluster overlay. The dark outer layer of the overlay prevents the indicator from being clearly visible
when it is not illuminated. An amber Light Emitting Diode (LED) behind the cutout in the opaque layer of the
overlay causes the indicator to appear in amber through the translucent outer layer of the overlay when it is
illuminated from behind by the LED, which is soldered onto the instrument cluster electronic circuit board.
The ESP/BAS indicator is serviced as a unit with the instrument cluster.
OPERATION
ESP/BAS INDICATOR
The ESP/BAS indicator gives an indication to the vehicle operator when the Electronic Stability Program
(ESP)/Brake Assist System (BAS) has been activated. This indicator is controlled by a transistor on the
instrument cluster circuit board based upon cluster programming and electronic messages received by the
cluster from the Controller Antilock Brake (CAB) and the All-Wheel Drive Control Module (AWDCM) over
the Controller Area Network (CAN) data bus.
The ESP/BAS indicator Light Emitting Diode (LED) is completely controlled by the instrument cluster logic
circuit, and that logic will only allow this indicator to operate when the instrument cluster receives a battery
current input on the fused ignition switch output (run-start) circuit. Therefore, the LED will always be OFF
when the ignition switch is in any position except ON or START. The LED only illuminates when it is provided
a path to ground by the instrument cluster transistor. The instrument cluster will turn ON the ESP/BAS indicator
for the following reasons:
Bulb Test - Each time the ignition switch is turned to the ON position the ESP/BAS indicator is
illuminated for about four seconds as a bulb test.
2007 Dodge Nitro R/T
2007 ACCESSORIES AND EQUIPMENT Instrument Cluster - Service Information - Nitro