Page 2449 of 4500
Fig. 17: [Display NORM]
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3.INSPECT STEERING PAD SWITCH ASSY
a. Turn the ignition switch to the ON position.
b. Push on the ON-OFF button of the cruise control main switch.
c. Push on the distance control switch (DISP2) of the steering pad switch.
d. Check that the indication of vehicle-to-vehicle distance, which is shown in the multi-information
displa
y on the combination meter, changes from "LONG", "MIDDLE" to "SHORT" in that order.
Page 2450 of 4500
Fig. 18: Multi-Information Display Chart On Combination Meter
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HINT:
The indication is immediately set to "LONG" each time the engine is started.
If a normal system code is displayed during the DTC check but the problem still occurs, check the suspected
areas for each problem symptom in the order given in the table below and proceed to the relevant
troubleshooting page.
HINT:
Inspect the "Fuse" and "Relay" before confirming the suspected areas as shown in the chart below. Inspect each
suspected area for the correspondin
g symptom in numerical order.
Page 2451 of 4500
Fig. 19: Problem Symptoms Chart
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Page 2452 of 4500
1.DISTANCE CONTROL ECU
Fig. 20: Identifying ECU Terminals
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ECU TERMINALS VOLTAGE AND RESISTANCE
a. Reference: waveform 1
HINT:
Terminal: LRDD - GND
Symbols (Terminals No.)Wiring
ColorTerminal
DescriptionConditionSpecified Condition
+B - GND (D2-1 - D2-12)R-B - BRBatteryAlways10 to 14 V
CANH (D2 - 8)LG
CAN
communication
signalCAN
communication
circuit
-
CANL (D2 - 9)L
CAN
communication
signalCAN
communication
circuit
-
SGND - Body ground
(D2-10 - Body ground)BR - Body
groundGroundAlwaysBelow 1 ohms
GND - Body ground (D2-
12 - Body ground)BR - Body
groundGroundAlwaysBelow 1 ohms
IGB - GND (D2-13 - D2-
12)L-O - BRIgnition switch ON
signalIgnition switch OFF
--> ONBelow 1 V --> 10 to
14 V
LRDD - GND (D2-22 -
D2-12)P-L - BRLaser sensor input
signalIgnition switch ONPulse generation (see
waveform 1)
LRRD - GND (D2-23 -
D2-12)L-Y - BRLaser sensor output
signalIgnition switch ONPulse generation (see
waveform 2)
Page 2453 of 4500
Gauge set: 2 V/DIV, 10 ms/DIV
Condition: Ignition switch ON
Fig. 21: Signal Waveform Graph (Waveform 1)
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b. Reference: waveform 2
HINT:
Terminal: LRRD - GND
Gauge set: 2 V/DIV, 5 ms/DIV
Condition: Ignition switch ON
Page 2454 of 4500
Fig. 22: Signal Waveform Graph (Waveform 2)
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c.ECM
Fig. 23: Identifying ECM Terminals
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Page 2455 of 4500
Fig. 24: ECM Terminals Voltage And Resistance Chart
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
If the value is not within the standard range, some defects on the vehicle are suspected.
d.LASER SENSOR
Page 2456 of 4500
Fig. 25: Identifying Laser Sensor Terminals
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LASER SENSOR TERMINALS VOLTAGE AND RESISTANCE
a. Reference: waveform 1
HINT:
Terminal: LRDD - SGND
Gauge set: 1 V/DIV, 2 ms/DIV
Symbols (Terminal No.)Wiring
ColorTerminal
DescriptionConditionSpecified Condition
LGND - Body ground (L1-
1 - Body ground)B-L - Body
groundDistance signalAlwaysBelow 1 ohms
SGND - Body ground (L1-
2 - Body ground)B-R - Body
groundGroundAlwaysBelow 1 ohms
LRDD - SGND (L1-3 -
L1-2)B-O - B-RLaser sensor
output signalIgnition
switch ONPulse generation (see
waveform 1)
LRRD - SGND (L1-4 -
L1-2)B-Y - B-RLaser sensor input
signalIgnition
switch ONPulse generation (see
waveform 2)
IGB - SGND (L1-5 - L1-2)B - B-RPower sourceIgnition
switch ON10 to 14 V