Inspection and verification
1. Check the validity of the customer's complaint.
2. Visually inspect for obvious signs of mechanical or electrical damage.
Visual inspection table
|
Mechanical factors |
Electrical factors |
|
• Windscreen wiper blade(s) • Windscreen wiper shaft • Windscreen washer reservoir • Hose(s) • Windscreen washer nozzles |
• Fuse(s) • Wiring harness • Electrical connector(s) • Windscreen washer pump(s) • Windscreen wiper motor(s). |
3. If an obvious cause for the complaint noted or received is found, correct that cause (if possible) before moving on to the next step.
4. If the cause of the complaint is not obvious, clarify the symptom of the malfunction and refer to the Symptoms Table.
Table of signs of malfunctions
|
State |
Possible Causes |
Action |
|
•No communication with the Central Timer Module (CTM) |
•Data bus (ISO 9141) •Central Timer Module (CTM) |
•For additional information, see Section 418-00. |
|
•Windscreen wipers do not work |
•Fuse box •Electrical circuit(s) •Windshield wiper relay. •Rear window wiper relay •Windscreen wiper/washer switch •Windshield wiper motor •Rear window wiper motor •Central Timer Module (CTM) •Central Junction Box (CJB) |
• Proceed to PINPOINT TEST A |
|
•Windscreen wipers operate continuously |
•Electrical circuit(s) •Windshield wiper relay. •Rear window wiper relay •Windscreen wiper/washer switch •Windshield wiper motor •Rear window wiper motor •Central Timer Module (CTM) •Central Junction Box (CJB) |
• Proceed to PINPOINT TEST B |
|
•Low/high speed wiper mode does not function properly (intermittent wiper mode functions properly) |
•Electrical circuit(s) •Windscreen wiper/washer switch •Windshield wiper motor |
• Proceed to PINPOINT TEST C |
|
•Intermittent wiper mode does not function properly (low/high speed wiper mode functions properly) |
•Electrical circuit(s) •Windscreen wiper/washer switch •Windshield wiper relay. •Central Timer Module (CTM) •Central Junction Box (CJB) |
• Proceed to PINPOINT TEST D |
|
•The washing and cleaning function does not work |
•Electrical circuit(s) •Windscreen wiper/washer switch •Windshield wiper relay. •Central Timer Module (CTM) •Central Junction Box (CJB) |
• Proceed to PINPOINT TEST E |
|
•Windscreen wipers do not stop in the correct idle position |
•Electrical circuit(s) •Windshield wiper motor •Rear window wiper motor •Windshield wiper relay. •Central Timer Module (CTM) •Central Junction Box (CJB) |
• Go to PINPOINT TEST F |
|
•One-touch cleaning function does not work |
•Windscreen wiper/washer switch |
•CHECK the wiper/washer switch according to the component testing instructions included with this section. If necessary, INSTALL a new component. CHECK the system for proper operation. |
|
•Windscreen wipers do not function properly in conjunction with the WASH function |
•Electrical circuit(s) •Central Timer Module (CTM) •Central Junction Box (CJB) |
• Proceed to PINPOINT TEST G |
|
•The windshield washer pump does not work |
•Electrical circuit(s) •Double-acting windshield washer pump electric motor |
• Proceed to PINPOINT TEST H |
|
•The adjustable intermittent cleaning mode is not functioning properly |
•Electrical circuit(s) •Windscreen wiper/washer switch •Central Timer Module (CTM) •Central Junction Box (CJB) |
• Proceed to PINPOINT TEST I |
|
•Low windshield washer fluid level indicator lamp is not functioning properly |
•Electrical circuit(s) •Low windshield washer fluid level relay •Trip computer module |
•For additional information, see Section 419-10. |
|
•The headlight washer function does not work properly |
•Fuse box •Electrical circuit(s) •Headlight washer relay •Headlamp washer pump motor •Battery Junction Box (BJB) |
• Proceed to PINPOINT TEST J |
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