ON-BOARD DIAGNOSTIC FUNCTION [DISCHARGE HEADLIGHT CONTROL MODULE]
id0918001077a0
Outline
• The on-board diagnostic function is incorporated into the discharge headlight control module (LH) and discharge headlight control module (RH). This function can narrow down discharge headlight malfunction locations.
• The on-board diagnostic function consists of the following functions: a failure detection function, which detects malfunctions in discharge headlight system-related parts; a memory function, which stores detected DTCs; a self-malfunction diagnostic function, which indicates system malfunctions using DTCs; and a PID/data monitoring function, which verifies the input/output condition of specific input/output signals being read out.
• Using an SST (WDS or equivalent), DTCs can be read out and deleted, and the PID/data monitoring function can be activated.
Block Diagram
Self-Malfunction Diagnostic Function
• The self-malfunction diagnostic function determines that there is a malfunction, and outputs a signal, as a DTC, to the DLC-2. The DTC can be read out using an SST (WDS or equivalent).
Failure Detection Function
• The failure detection function in each discharge headlight control module detects malfunctions in input/output signals.
• This function outputs the DTC for the detected malfunction to the DLC-2, and also sends the detected result to the memory function.
Memory Function
• The memory function stores the DTC for the malfunction of input/output signals for related parts, as determined by the failure detection function.
DTC table
|
DTC
|
Description
|
|
B2386
|
Discharge headlight illumination malfunction.
|
|
B2387
|
Ignitor circuit malfunction.
|
|
B2388
|
Discharge headlight operating voltage out of range.
|
|
B2389
|
Discharge headlight illumination malfunction.
|
|
B2391
|
Discharge headlight input resistance too high.
|
|
B2392
|
Discharge headlight input voltage high.
|
|
B2393
|
Discharge headlight control unit output circuit malfunction.
|
PID/Data Monitor Function
• The PID/data monitoring function optionally selects monitored input/output signal items that are set in the discharge headlight control module (LH) or the discharge headlight control module (RH), and performs read out in real time.
• An SST (WDS or equivalent) is used to read out the PID/data monitor information.
PID/Data monitor table (LHID)
|
PID name
|
Definition
|
Operation/unit
(WDS or equivalent)
|
|
CCNT
|
Number of continuous trouble codes
|
-
|
|
ONDEMDTC
|
Number of on-demand trouble codes
|
-
|
|
L_VOLT_L
|
Discharge headlight control (LH) input voltage
|
VOLTAGE
|
|
GDL_P_L
|
Output power to discharge headlight bulb (LH)
|
WATT
|
|
GDL_V_L
|
Output voltage to discharge headlight bulb (LH)
|
VOLTAGE
|
PID/Data monitor table (RHID)
|
PID name
|
Definition
|
Operation/unit
(WDS or equivalent)
|
|
CCNT
|
Number of continuous trouble codes
|
-
|
|
ONDEMDTC
|
Number of on-demand trouble codes
|
-
|
|
L_VOLT_R
|
Discharge headlight control unit (RH) input voltage
|
VOLTAGE
|
|
GDL_P_R
|
Output power to discharge headlight bulb (RH)
|
WATT
|
|
GDL_V_R
|
Output voltage to discharge headlight bulb (RH)
|
VOLTAGE
|