Body Control Systems: Other — Body Control Systems — Body, Cab Control Systems

SYSTEM TESTS

Note. Before proceeding with symptom testing, perform appropriate power source circuit test. See TEST NO. 1: BODY ECU POWER SOURCE CIRCUIT or TEST 18: BACK DOOR ECU POWER CIRCUIT .

For ECU terminal identification, see PIN VOLTAGE TESTS .

Description	Test No.
Body ECU Power Source Circuit	1
Rear Wiper Switch Circuit	2
Rear Washer Motor Circuit	3
Taillight Relay Circuit	4
Headlight Relay Circuit	5
Key Unlock Warning Switch Circuit	6
Back Door Power Window Switch Circuit	7
Door Lock Motor Circuit	8
Door Unlock Detection Switch Circuit	9
Door Key Lock & Unlock Switch Circuit	10
Door Lock Control Switch Circuit	11
Door Courtesy Switch Circuit	12
Hood Courtesy Switch Circuit	13
Theft Deterrent Indicator Circuit	14
Horn Circuit	15
Theft Deterrent Horn Circuit	16
MPX Circuit	17
Back Door ECU Power Circuit	18
Back Door Control Switch Circuit	19
Back Door Courtesy Switch Circuit	20
Back Door Unlock Detection Switch Circuit	21
Window Limit Switch Circuit	22
Rear Wiper Limit Switch Circuit	23
Back Door Power Window Motor Circuit	24
Rear Wiper Motor Circuit	25
Keyless Door Lock Buzzer Circuit	26

SYSTEM TEST INDEX

COMPONENT TESTS

Note. For component locations, see COMPONENT LOCATIONS .

COURTESY SWITCH

Disconnect door courtesy switch harness connector. Connect ohmmeter between body of door courtesy switch and electrical terminal. Continuity should exist when pin on door courtesy switch is released to on position. Continuity should not exist when pin on door courtesy switch is depressed to off position. Replace door courtesy switch if faulty.

KEY UNLOCK WARNING SWITCH

Disconnect key unlock warning switch 2-pin harness connector. Check continuity between key unlock warning switch connector terminals. (Scheme 5) Continuity should not exist when key is removed from ignition lock cylinder. Continuity should exist when key is inserted in ignition lock cylinder. Replace key unlock warning switch if continuity is not as specified.

Scheme 5

Scheme 5: KEY UNLOCK WARNING SWITCH

HEADLIGHT RELAY

Remove headlight control relay from engine room R/B. Check continuity between headlight relay terminals No. 4 and 3. See WIRING DIAGRAMS . Continuity should exist. Using jumper wires, apply battery voltage between terminals No. 4 and 3. Check continuity between terminals No. 1 and 2. Continuity should exist while battery voltage is applied. Continuity should not exist when battery voltage is removed. If continuity is not as specified, replace headlight relay.

TAILLIGHT RELAY

Remove taillight relay from engine compartment junction block. Check continuity between taillight relay terminals No. 1 and 2. See WIRING DIAGRAMS . Continuity should exist. Using jumper wires, apply battery voltage to terminals No. 1 and 2. Check continuity between terminals No. 3 and 5. Continuity should exist while battery voltage is applied. Continuity should not exist when battery voltage is removed. If continuity is not as specified, replace taillight relay.

TAILGATE SWITCH

Check continuity of tailgate switch. There should be continuity between terminals No. 2 and 3 when switch is in UP position and between terminals No. 1 and 3 when switch is in DOWN position. (Scheme 6) There should be no continuity when switch is in OFF position. If continuity is not as specified, replace switch.

Scheme 6

Scheme 6: TAILGATE SWITCH

PIN VOLTAGE TESTS

Ensure all pin voltage values at Body Electronic Control Unit (ECU) are within specifications. Measure voltage (backprobe) between body ground and appropriate terminal. (Scheme 7)and (Scheme 8). For pin voltages, see BODY ECU PIN VOLTAGE TEST and BACK DOOR ECU PIN VOLTAGE TEST tables.

Scheme 7

Scheme 7: PIN VOLTAGE TESTS

Terminal No. (1)	Condition	Volts
8-Pin Connector
1	Security Indicator On	10-14
1	Security Indicator Off	Less Than One
2	Security Horn On	10-14
2	Security Horn Off	Less Than One
3	Headlight Relay Off	10-14
3	Headlight Relay On	Less Than One
4	Taillight Relay Off	10-14
4	Taillight Relay On	Less Than One
7	Hood Courtesy Switch Off	10-14
7	Hood Courtesy Switch On	Less Than One
8	Rear Door Unlock Detection Switch Off	10-14
8	Rear Door Unlock Detection Switch On	Less Than One
15-Pin Connector
1-8	Horn Switch OFF	Less Than One
1-8	Horn Switch ON	10-14
2-8	(2) Ignition Switch OFF Or ACC Position	Less Than One
2-8	Ignition Switch ON	10-14
3-8	Under All Conditions	10-14
4-8	Rear Defogger Not Operating	10-14
4-8	Rear Defogger Operating	Less Than One
7-8	Under All Conditions	10-14
8	Under All Conditions	Less Than One
9-8	Ignition Switch OFF Or ACC Position	Less Than One
9-8	Ignition Switch ON	10-14
10-8	Ignition Switch OFF Or ACC Position	Less Than One
10-8	Ignition Switch ON	10-14
11-8	Driver Or Passenger Door Lock Control Switch OFF Or UNLOCK	10-14
11-8	Driver Or Passenger Door Lock Control Switch LOCK	Less Than One
12-8	Driver Or Passenger Door Lock Control Switch OFF Or LOCK	10-14
12-8	Driver Or Passenger Door Lock Control Switch UNLOCK	Less Than One
13-8	Rear Washer Switch OFF	10-14
13-8	Rear Washer Switch ON	Less Than One
14-8	Power Door Lock Not Operating Or Operating To Unlock	Less Than One
14-8	Power Door Lock Operating To Lock	10-14
15-8	Power Door Lock Not Operating Or Operating To Lock	Less Than One
15-8	Power Door Lock Operating To Unlock Twice	10-14
23-Pin Connector
1	Horn Switch OFF	10-14
1	Horn Switch ON	Less Than One
2	Key Not Inserted In Ignition Switch	10-14
2	Key Inserted In Ignition Switch	Less Than One
3	Rear Window Defogger Operating	Less Than 2
3	Rear Window Defogger Not Operating	10-14
4	Rear Power Window Switch OFF Or UP	10-14
4	Rear Power Window Switch DOWN	Less Than One
5	Rear Power Window switch OFF Or DOWN	10-14
5	Rear Power Window Switch UP	Less Than One
9	Ignition Switch OFF	Less Than One
9	Ignition Switch ON Or ACC Position	10-14
10	Under All Conditions	10-14
11	Driver And Passenger Door Key Lock & Unlock Switch OFF Or UNLOCK	10-14
11	Driver And Passenger Door Key Lock & Unlock Switch LOCK	Less Than One
12	Passenger Door Key Lock & Unlock Switch OFF Or UNLOCK	10-14
12	Passenger Door Key Lock & Unlock Switch UNLOCK	Less Than One
13	Driver Door Key Lock & Unlock Switch OFF Or LOCK	10-14
13	Driver Door Key Lock & Unlock Switch UNLOCK	Less Than One
14	Driver Door Unlock Detection Switch Off	10-14
14	Driver Door Unlock Detection Switch On	Less Than One
15	Rear Door Courtesy Switch Off	10-14
15	Any Rear Door Courtesy Switch On	Less Than One
16	Passenger Door Courtesy Switches Off	10-14
16	Passenger Door Courtesy Switch On	Less Than One
17	Driver Door Unlock Detection Switch Off	10-14
17	Driver Door Unlock Detection Switch On	Less Than One
18	Rear Defogger Switch OFF	10-14
18	Rear Defogger Switch ON	Less Than One
19	Driver Door Courtesy Switch Off	10-14
19	Driver Door Courtesy Switch On	Less Than One
20	Rear Wiper Switch OFF Or INTERMITTENT	10-14
20	Rear Wiper Switch ON	Less Than One
21	Rear Wiper Switch OFF Or ON	10-14
21	Rear Wiper Switch INTERMITTENT	Less Than One
22	Back Door Courtesy Switch Off	10-14
22	Back Door Courtesy Switch On	Less Than One
23	Power Door Lock Operating To Lock	10-14
23	Power Door Lock Not Operating Or Operating To Unlock	Less Than One
(1) Measure voltage between specified terminals or body ground. (2) During 60 seconds after ignition switch is turned ON to OFF (ACC) or until driver's or passenger's door is opened, after ignition switch is turned ON to OFF (ACC).

(1)	Measure voltage between specified terminals or body ground.

(2)	During 60 seconds after ignition switch is turned ON to OFF (ACC) or until driver's or passenger's door is opened, after ignition switch is turned ON to OFF (ACC).

BODY ECU PIN VOLTAGE TEST

Scheme 8

Terminal No.	Condition	Volts
1-26	Under All Conditions	10-14
2-26	Under All Conditions	10-14
3-26	Ignition Switch OFF Or ACC Position	Less Than One
3-26	Ignition Switch ON	10-14
4-5	Keyless Door Lock Buzzer Sounding	10-14
4-5	Keyless Door Lock Buzzer Off	Less Than One
7-26	Rear Door Courtesy Switch Off	10-14
7-26	Rear Door Courtesy Switch On	Less Than One
9-26	Rear Door Control Switch OFF or DOWN	10-14
9-26	Rear Door Control Switch UP	Less Than One
10-26	Rear Door Control Switch OFF or UP	10-14
10-26	Rear Door Control Switch DOWN	Less Than One
11-26	Back Door Power Window Not Operating	Less Than One
11-26	Back Door Power Window Operating Upward	10-14
12-26	Back Door Power Window Not Operating	Less Than One
12-26	Back Door Power Window Operating Downward	10-14
13-26	Rear Door Window Limit Switch Off	10-14
13-26	Rear Door Window Limit Switch On	Less Than One
20-26 (1)	Rear Door Unlock Detection Switch Off	10-14
20-26 (1)	Rear Door Unlock Detection Switch On	Less Than One
22-26 (2)	Rear Wiper Arm In Storing Position	10-14
22-26 (2)	Rear Wiper Arm Not In Storing Position	Less Than One
22-26 (3)	Under All Conditions	Less Than One
23-26 (2)	Rear Wiper Arm Between Stopping And Reversing Position	10-14
23-26 (2)	Rear Wiper Arm In Stopping And Reversing Position	Less Than One
23-26 (3)	Under All Conditions	Less Than One
24-26 (2)	Rear Wiper Not Operating	Less Than One
24-26 (2)	Rear Wiper Operating In Reverse	10-14
25-26	Rear Wiper Not Operating	Less Than One
25-26	Rear Wiper Operating	10-14
26 & Ground	Under All Conditions	Less Than One
(1) With theft deterrent system. (2) With rear wiper. (3) Without rear wiper.